The Collaborative International Dictionary of English v.0.48:

Grab \Grab\ (gr[a^]b), n. [Ar. & Hind. ghur[=a]b crow, raven, a
   kind of Arab ship.] (Naut.)
   A vessel used on the Malabar coast, having two or three
   masts.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grab \Grab\ (gr[a^]b), v. t. & i. [imp. & p. p. Grabbed
   (gr[a^]bd); p. pr. & vb. n. Grabbing.] [Akin to Sw. grabba
   to grasp. Cf. Grabble, Grapple, Grasp.]
   To gripe suddenly; to seize; to snatch; to clutch.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Grab \Grab\, n.
   1. A sudden grasp or seizure.
      [1913 Webster]

   2. An instrument for clutching objects for the purpose of
      raising them; -- specially applied to devices for
      withdrawing drills, etc., from artesian and other wells
      that are drilled, bored, or driven.
      [1913 Webster]

   Grab bag, at fairs, a bag or box holding small articles
      which are to be drawn, without being seen, on payment of a
      small sum. [Colloq.]

   Grab game, a theft committed by grabbing or snatching a
      purse or other piece of property. [Colloq.]
      [1913 Webster]

WordNet (r) 3.0 (2006):

grab
    n 1: a mechanical device for gripping an object
    2: the act of catching an object with the hands; "Mays made the
       catch with his back to the plate"; "he made a grab for the
       ball before it landed"; "Martin's snatch at the bridle failed
       and the horse raced away"; "the infielder's snap and throw
       was a single motion" [syn: catch, grab, snatch, snap]
    v 1: take hold of so as to seize or restrain or stop the motion
         of; "Catch the ball!"; "Grab the elevator door!" [syn:
         catch, grab, take hold of]
    2: get hold of or seize quickly and easily; "I snapped up all
       the good buys during the garage sale" [syn: snap up,
       snaffle, grab]
    3: make a grasping or snatching motion with the hand; "The
       passenger grabbed for the oxygen mask"
    4: obtain illegally or unscrupulously; "Grab power"
    5: take or grasp suddenly; "She grabbed the child's hand and ran
       out of the room"
    6: capture the attention or imagination of; "This story will
       grab you"; "The movie seized my imagination" [syn: grab,
       seize]

Moby Thesaurus II by Grady Ward, 1.0:

111 Moby Thesaurus words for "grab":
   abduct, abduction, absorb, absorb the attention, annex, apprehend,
   apprehension, appropriate, arrest, arrest the thoughts,
   arrestation, arrogate, burglary, caper, capture, carry off, catch,
   catch the thoughts, catching, charm, clutch, collar, collaring,
   commandeer, coup, desire, dragnet, enchant, engage,
   engage the attention, engage the mind, engage the thoughts,
   engross, engross the mind, engross the thoughts, enthrall,
   exercise, expropriate, fascinate, fasten upon, filch,
   forcible seizure, get at, get hold of, glom on to, grab at,
   grabbing, grapple, grasp, grip, heist, hit, hold, hold spellbound,
   hold the interest, hypnotize, immerse, impress, involve,
   involve the interest, job, jump at, kidnap, kidnapping,
   lay hands on, lay hold of, lift, make an impression, mesmerize,
   monopolize, nab, nabbing, nail, obsess, occupy,
   occupy the attention, pick up, picking up, pinch, power grab,
   prehension, preoccupy, put under arrest, rip-off, robbery, run in,
   running in, seize, seizure, seizure of power, shanghai, sink in,
   snag, snatch, snatch at, snatching, spellbind, steal, strike, take,
   take in, take into custody, take over, take possession,
   take prisoner, take up, taking in, taking into custody, theft,
   throttle, usurp