The Collaborative International Dictionary of English v.0.48:

Foot \Foot\ (f[oo^]t), n.; pl. Feet (f[=e]t). [OE. fot, foot,
   pl. fet, feet. AS. f[=o]t, pl. f[=e]t; akin to D. voet, OHG.
   fuoz, G. fuss, Icel. f[=o]tr, Sw. fot, Dan. fod, Goth.
   f[=o]tus, L. pes, Gr. poy`s, Skr. p[=a]d, Icel. fet step,
   pace measure of a foot, feta to step, find one's way.
   [root]77, 250. Cf. Antipodes, Cap-a-pie, Expedient,
   Fet to fetch, Fetlock, Fetter, Pawn a piece in chess,
   Pedal.]
   1. (Anat.) The terminal part of the leg of man or an animal;
      esp., the part below the ankle or wrist; that part of an
      animal upon which it rests when standing, or moves. See
      Manus, and Pes.
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   2. (Zool.) The muscular locomotive organ of a mollusk. It is
      a median organ arising from the ventral region of body,
      often in the form of a flat disk, as in snails. See
      Illust. of Buccinum.
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   3. That which corresponds to the foot of a man or animal; as,
      the foot of a table; the foot of a stocking.
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   4. The lowest part or base; the ground part; the bottom, as
      of a mountain, column, or page; also, the last of a row or
      series; the end or extremity, esp. if associated with
      inferiority; as, the foot of a hill; the foot of the
      procession; the foot of a class; the foot of the bed;; the
      foot of the page.
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            And now at foot
            Of heaven's ascent they lift their feet. --Milton.
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   5. Fundamental principle; basis; plan; -- used only in the
      singular.
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            Answer directly upon the foot of dry reason.
                                                  --Berkeley.
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   6. Recognized condition; rank; footing; -- used only in the
      singular. [R.]
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            As to his being on the foot of a servant. --Walpole.
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   7. A measure of length equivalent to twelve inches; one third
      of a yard. See Yard.
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   Note: This measure is supposed to be taken from the length of
         a man's foot. It differs in length in different
         countries. In the United States and in England it is
         304.8 millimeters.
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   8. (Mil.) Soldiers who march and fight on foot; the infantry,
      usually designated as the foot, in distinction from the
      cavalry. "Both horse and foot." --Milton.
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   9. (Pros.) A combination of syllables consisting a metrical
      element of a verse, the syllables being formerly
      distinguished by their quantity or length, but in modern
      poetry by the accent.
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   10. (Naut.) The lower edge of a sail.
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   Note: Foot is often used adjectively, signifying of or
         pertaining to a foot or the feet, or to the base or
         lower part. It is also much used as the first of
         compounds.
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   Foot artillery. (Mil.)
       (a) Artillery soldiers serving in foot.
       (b) Heavy artillery. --Farrow.

   Foot bank (Fort.), a raised way within a parapet.

   Foot barracks (Mil.), barracks for infantery.

   Foot bellows, a bellows worked by a treadle. --Knight.

   Foot company (Mil.), a company of infantry. --Milton.

   Foot gear, covering for the feet, as stocking, shoes, or
      boots.

   Foot hammer (Mach.), a small tilt hammer moved by a
      treadle.

   Foot iron.
       (a) The step of a carriage.
       (b) A fetter.

   Foot jaw. (Zool.) See Maxilliped.

   Foot key (Mus.), an organ pedal.

   Foot level (Gunnery), a form of level used in giving any
      proposed angle of elevation to a piece of ordnance.
      --Farrow.

   Foot mantle, a long garment to protect the dress in riding;
      a riding skirt. [Obs.]

   Foot page, an errand boy; an attendant. [Obs.]

   Foot passenger, one who passes on foot, as over a road or
      bridge.

   Foot pavement, a paved way for foot passengers; a footway;
      a trottoir.

   Foot poet, an inferior poet; a poetaster. [R.] --Dryden.

   Foot post.
       (a) A letter carrier who travels on foot.
       (b) A mail delivery by means of such carriers.

   Fot pound, & Foot poundal. (Mech.) See Foot pound and
      Foot poundal, in the Vocabulary.

   Foot press (Mach.), a cutting, embossing, or printing
      press, moved by a treadle.

   Foot race, a race run by persons on foot. --Cowper.

   Foot rail, a railroad rail, with a wide flat flange on the
      lower side.

   Foot rot, an ulcer in the feet of sheep; claw sickness.

   Foot rule, a rule or measure twelve inches long.

   Foot screw, an adjusting screw which forms a foot, and
      serves to give a machine or table a level standing on an
      uneven place.

   Foot secretion. (Zool.) See Sclerobase.

   Foot soldier, a soldier who serves on foot.

   Foot stick (Printing), a beveled piece of furniture placed
      against the foot of the page, to hold the type in place.


   Foot stove, a small box, with an iron pan, to hold hot
      coals for warming the feet.

   Foot tubercle. (Zool.) See Parapodium.

   Foot valve (Steam Engine), the valve that opens to the air
      pump from the condenser.

   Foot vise, a kind of vise the jaws of which are operated by
      a treadle.

   Foot waling (Naut.), the inside planks or lining of a
      vessel over the floor timbers. --Totten.

   Foot wall (Mining), the under wall of an inclosed vein.
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   By foot, or On foot, by walking; as, to pass a stream on
      foot.

   Cubic foot. See under Cubic.

   Foot and mouth disease, a contagious disease (Eczema
      epizo["o]tica) of cattle, sheep, swine, etc.,
      characterized by the formation of vesicles and ulcers in
      the mouth and about the hoofs.

   Foot of the fine (Law), the concluding portion of an
      acknowledgment in court by which, formerly, the title of
      land was conveyed. See Fine of land, under Fine, n.;
      also Chirograph. (b).

   Square foot. See under Square.

   To be on foot, to be in motion, action, or process of
      execution.

   To keep the foot (Script.), to preserve decorum. "Keep thy
      foot when thou goest to the house of God." --Eccl. v. 1.

   To put one's foot down, to take a resolute stand; to be
      determined. [Colloq.]

   To put the best foot foremost, to make a good appearance;
      to do one's best. [Colloq.]

   To set on foot, to put in motion; to originate; as, to set
      on foot a subscription.

   To put one on his feet, or set one on his feet, to put
      one in a position to go on; to assist to start.

   Under foot.
       (a) Under the feet; (Fig.) at one's mercy; as, to trample
           under foot. --Gibbon.
       (b) Below par. [Obs.] "They would be forced to sell . . .
           far under foot." --Bacon.
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The Collaborative International Dictionary of English v.0.48:

Square \Square\ (skw[^a]r), a.
   1. (Geom.) Having four equal sides and four right angles; as,
      a square figure.
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   2. Forming a right angle; as, a square corner.
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   3. Having a shape broad for the height, with rectilineal and
      angular rather than curving outlines; as, a man of a
      square frame.
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   4. Exactly suitable or correspondent; true; just.
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            She's a most triumphant lady, if report be square to
            her.                                  --Shak.
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   5. Rendering equal justice; exact; fair; honest; as, square
      dealing.
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   6. Even; leaving no balance; as, to make or leave the
      accounts square.
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   7. Leaving nothing; hearty; vigorous.
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            By Heaven, square eaters.
            More meat, I say.                     --Beau. & Fl.
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   8. (Naut.) At right angles with the mast or the keel, and
      parallel to the horizon; -- said of the yards of a
      square-rigged vessel when they are so braced.
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   Note: Square is often used in self-explaining compounds or
         combinations, as in square-built, square-cornered,
         square-cut, square-nosed, etc.
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   Square foot, an area equal to that of a square the sides of
      which are twelve inches; 144 square inches.

   Square knot, a knot in which the terminal and standing
      parts are parallel to each other; a reef knot. See Illust.
      under Knot.

   Square measure, the measure of a superficies or surface
      which depends on the length and breadth taken conjointly.
      The units of square measure are squares whose sides are
      the linear measures; as, square inches, square feet,
      square meters, etc.

   Square number. See Square, n., 6.

   Square root of a number or Square root of a quantity
      (Math.), that number or quantity which, multiplied by
      itself, produces the given number or quantity.

   Square sail (Naut.), a four-sided sail extended upon a yard
      suspended by the middle; sometimes, the foresail of a
      schooner set upon a yard; also, a cutter's or sloop's sail
      boomed out. See Illust. of Sail.

   Square stern (Naut.), a stern having a transom and joining
      the counter timbers at an angle, as distinguished from a
      round stern, which has no transom.

   Three-square, Five-square, etc., having three, five,
      etc., equal sides; as, a three-square file.

   To get square with, to get even with; to pay off. [Colloq.]
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WordNet (r) 3.0 (2006):

square foot
    n 1: a unit of area equal to one foot by one foot square [syn:
         square foot, sq ft]