The Collaborative International Dictionary of English v.0.48:

Sparrow \Spar"row\, n. [OE. sparwe, AS. spearwa; akin to OHG.
   sparo, G. sperling, Icel. sp["o]rr, Dan. spurv, spurre, Sw.
   sparf, Goth. sparwa; -- originally, probably, the quiverer or
   flutterer, and akin to E. spurn. See Spurn, and cf.
   Spavin.]
   1. (Zool.) One of many species of small singing birds of the
      family Fringilligae, having conical bills, and feeding
      chiefly on seeds. Many sparrows are called also finches,
      and buntings. The common sparrow, or house sparrow, of
      Europe (Passer domesticus) is noted for its familiarity,
      its voracity, its attachment to its young, and its
      fecundity. See House sparrow, under House.
      [1913 Webster]

   Note: The following American species are well known; the
         chipping sparrow, or chippy, the sage sparrow,
         the savanna sparrow, the song sparrow, the tree
         sparrow, and the white-throated sparrow (see
         Peabody bird). See these terms under Sage,
         Savanna, etc.
         [1913 Webster]

   2. (Zool.) Any one of several small singing birds somewhat
      resembling the true sparrows in form or habits, as the
      European hedge sparrow. See under Hedge.
      [1913 Webster]

            He that doth the ravens feed,
            Yea, providently caters for the sparrow,
            Be comfort to my age!                 --Shak.
      [1913 Webster]

   Field sparrow, Fox sparrow, etc. See under Field,
      Fox, etc.

   Sparrow bill, a small nail; a castiron shoe nail; a
      sparable.

   Sparrow hawk. (Zool.)
      (a) A small European hawk (Accipiter nisus) or any of
          the allied species.
      (b) A small American falcon (Falco sparverius).
      (c) The Australian collared sparrow hawk (Accipiter
          torquatus).

   Note: The name is applied to other small hawks, as the
         European kestrel and the New Zealand quail hawk.

   Sparrow owl (Zool.), a small owl (Glaucidium passerinum)
      found both in the Old World and the New. The name is also
      applied to other species of small owls.

   Sparrow spear (Zool.), the female of the reed bunting.
      [Prov. Eng.]
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

field \field\ (f[=e]ld), n. [OE. feld, fild, AS. feld; akin to
   D. veld, G. feld, Sw. f[aum]lt, Dan. felt, Icel. fold field
   of grass, AS. folde earth, land, ground, OS. folda.]
   1. Cleared land; land suitable for tillage or pasture;
      cultivated ground; the open country.
      [1913 Webster]

   2. A piece of land of considerable size; esp., a piece
      inclosed for tillage or pasture.
      [1913 Webster]

            Fields which promise corn and wine.   --Byron.
      [1913 Webster]

   3. A place where a battle is fought; also, the battle itself.
      [1913 Webster]

            In this glorious and well-foughten field. --Shak.
      [1913 Webster]

            What though the field be lost?        --Milton.
      [1913 Webster]

   4. An open space; an extent; an expanse. Esp.:
      (a) Any blank space or ground on which figures are drawn
          or projected.
      (b) The space covered by an optical instrument at one
          view; as, wide-field binoculars.
          [1913 Webster + PJC]

                Without covering, save yon field of stars.
                                                  --Shak.
          [1913 Webster]

                Ask of yonder argent fields above. --Pope.
          [1913 Webster]

   5. (Her.) The whole surface of an escutcheon; also, so much
      of it is shown unconcealed by the different bearings upon
      it. See Illust. of Fess, where the field is represented
      as gules (red), while the fess is argent (silver).
      [1913 Webster]

   6. An unresticted or favorable opportunity for action,
      operation, or achievement; province; room.
      [1913 Webster]

            Afforded a clear field for moral experiments.
                                                  --Macaulay.
      [1913 Webster]

   7. (Sports) An open, usually flat, piece of land on which a
      sports contest is played; a playing field; as, a football
      field; a baseball field.

   Syn: playing field, athletic field, playing area.
        [PJC]

   8. Specifically: (Baseball) That part of the grounds reserved
      for the players which is outside of the diamond; -- called
      also outfield.
      [1913 Webster]

   9. A geographic region (land or sea) which has some notable
      feature, activity or valuable resource; as, the diamond
      fields of South Africa; an oil field; a gold field; an ice
      field.
      [WordNet 1.6]

   10. A facility having an airstrip where airplanes can take
       off and land; an airfield.

   Syn: airfield, landing field, flying field, aerodrome.
        [WordNet 1.6]

   11. A collective term for all the competitors in any outdoor
       contest or trial, or for all except the favorites in the
       betting.
       [1913 Webster]

   12. A branch of knowledge or sphere of activity; especially,
       a learned or professional discipline; as, she's an expert
       in the field of geology; in what field did she get her
       doctorate?; they are the top company in the field of
       entertainment.

   Syn: discipline, subject, subject area, subject field, field
        of study, study, branch of knowledge.
        [WordNet 1.6]

   Note: Within the master text files of this electronic
         dictionary, where a word is used in a specific sense in
         some specialized field of knowledge, that field is
         indicated by the tags: () preceding that sense of the
         word.
         [PJC]

   13. A location, usually outdoors, away from a studio or
       office or library or laboratory, where practical work is
       done or data is collected; as, anthropologists do much of
       their work in the field; the paleontologist is in the
       field collecting specimens. Usually used in the phrase

   in the field.
      [WordNet 1.6]

   14. (Physics) The influence of a physical object, such as an
       electrically charged body, which is capable of exerting
       force on objects at a distance; also, the region of space
       over which such an influence is effective; as, the
       earth's gravitational field; an electrical field; a
       magnetic field; a force field.
       [PJC]

   15. (Math.) A set of elements within which operations can be
       defined analagous to the operations of addition,
       subtraction, multiplication, and division on the real
       numbers; within such a set of elements addition and
       multiplication are commutative and associative and
       multiplication is distributive over addition and there
       are two elements 0 and 1; a commutative division ring;
       as, the set of all rational numbers is a field.
       [WordNet 1.6]

   Note: Field is often used adjectively in the sense of
         belonging to, or used in, the fields; especially with
         reference to the operations and equipments of an army
         during a campaign away from permanent camps and
         fortifications. In most cases such use of the word is
         sufficiently clear; as, field battery; field
         fortification; field gun; field hospital, etc. A field
         geologist, naturalist, etc., is one who makes
         investigations or collections out of doors. A survey
         uses a field book for recording field notes, i.e.,
         measurment, observations, etc., made in field work
         (outdoor operations). A farmer or planter employs field
         hands, and may use a field roller or a field derrick.
         Field sports are hunting, fishing, athletic games, etc.
         [1913 Webster]

   Coal field (Geol.) See under Coal.

   Field artillery, light ordnance mounted on wheels, for the
      use of a marching army.

   Field basil (Bot.), a plant of the Mint family (Calamintha
      Acinos); -- called also basil thyme.

   Field colors (Mil.), small flags for marking out the
      positions for squadrons and battalions; camp colors.

   Field cricket (Zool.), a large European cricket (Gryllus
      campestric), remarkable for its loud notes.

   Field day.
       (a) A day in the fields.
       (b) (Mil.) A day when troops are taken into the field for
           instruction in evolutions. --Farrow.
       (c) A day of unusual exertion or display; a gala day.

   Field driver, in New England, an officer charged with the
      driving of stray cattle to the pound.

   Field duck (Zool.), the little bustard (Otis tetrax),
      found in Southern Europe.

   Field glass. (Optics)
       (a) A binocular telescope of compact form; a lorgnette; a
           race glass.
       (b) A small achromatic telescope, from 20 to 24 inches
           long, and having 3 to 6 draws.
       (c) See Field lens.

   Field lark. (Zool.)
       (a) The skylark.
       (b) The tree pipit.

   Field lens (Optics), that one of the two lenses forming the
      eyepiece of an astronomical telescope or compound
      microscope which is nearer the object glass; -- called
      also field glass.

   Field madder (Bot.), a plant (Sherardia arvensis) used in
      dyeing.

   Field marshal (Mil.), the highest military rank conferred
      in the British and other European armies.

   Field officer (Mil.), an officer above the rank of captain
      and below that of general.

   Field officer's court (U.S.Army), a court-martial
      consisting of one field officer empowered to try all
      cases, in time of war, subject to jurisdiction of garrison
      and regimental courts. --Farrow.

   Field plover (Zool.), the black-bellied plover (Charadrius
      squatarola); also sometimes applied to the Bartramian
      sandpiper (Bartramia longicauda).

   Field spaniel (Zool.), a small spaniel used in hunting
      small game.

   Field sparrow. (Zool.)
       (a) A small American sparrow (Spizella pusilla).
       (b) The hedge sparrow. [Eng.]

   Field staff (Mil.), a staff formerly used by gunners to
      hold a lighted match for discharging a gun.

   Field vole (Zool.), the European meadow mouse.

   Field of ice, a large body of floating ice; a pack.

   Field, or Field of view, in a telescope or microscope,
      the entire space within which objects are seen.

   Field magnet. see under Magnet.

   Magnetic field. See Magnetic.

   To back the field, or To bet on the field. See under
      Back, v. t. -- To keep the field.
       (a) (Mil.) To continue a campaign.
       (b) To maintain one's ground against all comers.

   To lay against the field or To back against the field, to
      bet on (a horse, etc.) against all comers.

   To take the field (Mil.), to enter upon a campaign.
      [1913 Webster]

WordNet (r) 3.0 (2006):

field sparrow
    n 1: common North American finch of brushy pasturelands [syn:
         field sparrow, Spizella pusilla]