The Collaborative International Dictionary of English v.0.48:

Hammer \Ham"mer\ (h[a^]m"m[~e]r), n. [OE. hamer, AS. hamer,
   hamor; akin to D. hamer, G. & Dan. hammer, Sw. hammare, Icel.
   hamarr, hammer, crag, and perh. to Gr. 'a`kmwn anvil, Skr.
   a[,c]man stone.]
   1. An instrument for driving nails, beating metals, and the
      like, consisting of a head, usually of steel or iron,
      fixed crosswise to a handle.
      [1913 Webster]

            With busy hammers closing rivets up.  --Shak.
      [1913 Webster]

   2. Something which in form or action resembles the common
      hammer; as:
      (a) That part of a clock which strikes upon the bell to
          indicate the hour.
      (b) The padded mallet of a piano, which strikes the wires,
          to produce the tones.
      (c) (Anat.) The malleus. See under Ear.
      (d) (Gun.) That part of a gunlock which strikes the
          percussion cap, or firing pin; the cock; formerly,
          however, a piece of steel covering the pan of a
          flintlock musket and struck by the flint of the cock
          to ignite the priming.
      (e) Also, a person or thing that smites or shatters; as,
          St. Augustine was the hammer of heresies.
          [1913 Webster]

                He met the stern legionaries [of Rome] who had
                been the "massive iron hammers" of the whole
                earth.                            --J. H.
                                                  Newman.
          [1913 Webster]

   3. (Athletics) A spherical weight attached to a flexible
      handle and hurled from a mark or ring. The weight of head
      and handle is usually not less than 16 pounds.
      [Webster 1913 Suppl.]

   Atmospheric hammer, a dead-stroke hammer in which the
      spring is formed by confined air.

   Drop hammer, Face hammer, etc. See under Drop, Face,
      etc.

   Hammer fish. See Hammerhead.

   Hammer hardening, the process of hardening metal by
      hammering it when cold.

   Hammer shell (Zool.), any species of Malleus, a genus of
      marine bivalve shells, allied to the pearl oysters, having
      the wings narrow and elongated, so as to give them a
      hammer-shaped outline; -- called also hammer oyster.

   To bring to the hammer, to put up at auction.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hammer \Ham"mer\, v. t. [imp. & p. p. Hammered (-m[~e]rd); p.
   pr. & vb. n. Hammering.]
   1. To beat with a hammer; to beat with heavy blows; as, to
      hammer iron.
      [1913 Webster]

   2. To form or forge with a hammer; to shape by beating.
      "Hammered money." --Dryden.
      [1913 Webster]

   3. To form in the mind; to shape by hard intellectual labor;
      -- usually with out.
      [1913 Webster]

            Who was hammering out a penny dialogue. --Jeffry.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Hammer \Ham"mer\, v. i.
   1. To be busy forming anything; to labor hard as if shaping
      something with a hammer.
      [1913 Webster]

            Whereon this month I have been hammering. --Shak.
      [1913 Webster]

   2. To strike repeated blows, literally or figuratively.
      [1913 Webster]

            Blood and revenge are hammering in my head. --Shak.
      [1913 Webster]

WordNet (r) 3.0 (2006):

hammer
    n 1: the part of a gunlock that strikes the percussion cap when
         the trigger is pulled [syn: hammer, cock]
    2: a hand tool with a heavy rigid head and a handle; used to
       deliver an impulsive force by striking
    3: the ossicle attached to the eardrum [syn: malleus,
       hammer]
    4: a light drumstick with a rounded head that is used to strike
       such percussion instruments as chimes, kettledrums, marimbas,
       glockenspiels, etc. [syn: mallet, hammer]
    5: a heavy metal sphere attached to a flexible wire; used in the
       hammer throw
    6: a striker that is covered in felt and that causes the piano
       strings to vibrate
    7: a power tool for drilling rocks [syn: hammer, power
       hammer]
    8: the act of pounding (delivering repeated heavy blows); "the
       sudden hammer of fists caught him off guard"; "the pounding
       of feet on the hallway" [syn: hammer, pound, hammering,
       pounding]
    v 1: beat with or as if with a hammer; "hammer the metal flat"
    2: create by hammering; "hammer the silver into a bowl"; "forge
       a pair of tongues" [syn: forge, hammer]

Moby Thesaurus II by Grady Ward, 1.0:

153 Moby Thesaurus words for "hammer":
   Eustachian tube, air hammer, anvil, assault, attack,
   auditory apparatus, auditory canal, auditory meatus,
   auditory nerve, auditory ossicles, auditory tube, auricle,
   ball peen hammer, bang, barbarize, basilar membrane, baste, batter,
   beat, beetle, belabor, bony labyrinth, brutalize, buffet, burn,
   butcher, carry on, cauliflower ear, chipping hammer, claw hammer,
   cochlea, conch, concha, destroy, dig, din, ding, drive,
   drop hammer, drub, drudge, drum, drumhead, ear, ear lobe, eardrum,
   elaborate, electric hammer, endolymph, external ear, fag, fashion,
   flail, flap, form, go on, grave, grind, grub, hammer away, incus,
   inner ear, jackhammer, knock, lambaste, larrup, lay waste, lobe,
   lobule, loot, lug, mallet, malleus, mastoid process, maul,
   middle ear, moil, mug, organ of Corti, outer ear, oval window,
   paste, patter, peg, peg away, pelt, perilymph, pile hammer,
   pillage, pinna, plod, plug, plug along, plug away, pommel, pound,
   pound away, pulverize, pummel, rage, raising hammer, ramp, rampage,
   rant, rap, rape, rave, riot, riveting hammer, roar, round window,
   rubber mallet, ruin, sack, savage, secondary eardrum,
   semicircular canals, shape, shell, slaughter, sledge, sledgehammer,
   slog, sow chaos, spank, stamp, stapes, steam hammer, stirrup,
   stone hammer, storm, stutter, tack hammer, tear, tear around,
   terrorize, thrash, thresh, thump, toil, travail, triphammer,
   tympanic cavity, tympanic membrane, tympanum, vandalize, vestibule,
   violate, wade through, wallop, whip, work away, wreck



The Jargon File (version 4.4.7, 29 Dec 2003):

hammer
 vt.

    Commonwealth hackish syn. for bang on.


The Free On-line Dictionary of Computing (30 December 2018):

hammer

   Commonwealth hackish synonym for bang on.

   [Jargon File]

   (1995-02-16)


Easton's 1897 Bible Dictionary:

Hammer
   (1.) Heb. pattish, used by gold-beaters (Isa. 41:7) and by
   quarry-men (Jer. 23:29). Metaphorically of Babylon (Jer. 50:23)
   or Nebuchadnezzar.

     (2.) Heb. makabah, a stone-cutter's mallet (1 Kings 6:7), or
   of any workman (Judg. 4:21; Isa. 44:12).

     (3.) Heb. halmuth, a poetical word for a workman's hammer,
   found only in Judg. 5:26, where it denotes the mallet with which
   the pins of the tent of the nomad are driven into the ground.

     (4.) Heb. mappets, rendered "battle-axe" in Jer. 51:20. This
   was properly a "mace," which is thus described by Rawlinson:
   "The Assyrian mace was a short, thin weapon, and must either
   have been made of a very tough wood or (and this is more
   probable) of metal. It had an ornamented head, which was
   sometimes very beautifully modelled, and generally a strap or
   string at the lower end by which it could be grasped with
   greater firmness."