The Collaborative International Dictionary of English v.0.48:

Pounce \Pounce\, v. t. [imp. & p. p. Pounded; p. pr. & vb. n.
   Pouncing.]
   To sprinkle or rub with pounce; as, to pounce paper, or a
   pattern.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pounce \Pounce\, n. [Prob. through French, from an assumed LL.
   punctiare to prick, L. pungere, punctum. See Puncheon,
   Punch, v. t.]
   1. The claw or talon of a bird of prey. --Spenser. Burke.
      [1913 Webster]

   2. A punch or stamp. [Obs.] "A pounce to print money with."
      --Withals.
      [1913 Webster]

   3. Cloth worked in eyelet holes. [Obs.] --Homilies.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pounce \Pounce\, n. [F. ponce pumice, pounce, fr. L. pumex,
   -icis, pumice. See Pumice.]
   1. A fine powder, as of sandarac, or cuttlefish bone, --
      formerly used to prevent ink from spreading on manuscript.
      [1913 Webster]

   2. Charcoal dust, or some other colored powder for making
      patterns through perforated designs, -- used by
      embroiderers, lace makers, etc.
      [1913 Webster]

   Pounce box, a box for sprinkling pounce.

   Pounce paper, a transparent paper for tracing.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pounce \Pounce\, v. t.
   1. To strike or seize with the talons; to pierce, as with the
      talons. [Archaic]
      [1913 Webster]

            Stooped from his highest pitch to pounce a wren.
                                                  --Cowper.
      [1913 Webster]

            Now pounce him lightly,
            And as he roars and rages, let's go deeper. --J.
                                                  Fletcher.
      [1913 Webster]

   2. To punch; to perforate; to stamp holes in, or dots on, by
      way of ornament. [Obs.] --Sir T. Elyot.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pounce \Pounce\, v. i.
   To fall suddenly and seize with the claws; -- with on or
   upon; as, a hawk pounces upon a chicken. Also used
   figuratively.
   [1913 Webster]

         Derision is never so agonizing as when it pounces on
         the wanderings of misguided sensibility. --Jeffrey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

pounce
    n 1: the act of pouncing
    v 1: move down on as if in an attack; "The raptor swooped down
         on its prey"; "The teacher swooped down upon the new
         students" [syn: pounce, swoop]

Moby Thesaurus II by Grady Ward, 1.0:

169 Moby Thesaurus words for "pounce":
   Highland fling, ambush, and jump, attack, belly buster, belly flop,
   belly whopper, bounce, bound, broad jump, buck, buckjump,
   cannonball, capriole, cascade, cataract, chute, claws, clear,
   clutches, collapse, come down, comedown, crash, crash dive, curvet,
   debacle, declension, declination, defluxion, demivolt, descend,
   descending, descension, descent, digits, dip down, dive, down,
   downbend, downcome, downcurve, downfall, downflow, downgrade,
   downpour, downrush, downtrend, downturn, downward trend, drop,
   drop down, drop off, dropping, fall, fall down, fall off,
   fall upon, falling, fangs, fingernails, fingers, flying jump,
   gainer, galliard, gelandesprung, go down, go downhill, grand jete,
   gravitate, gravitation, hands, handspring, header, high jump,
   hippety-hop, hooks, hop, hurdle, inclination, jackknife, jaws,
   jete, jig, jump, jump at, jump on, jump over, jump shot, jump turn,
   jump-hop, jump-off, lavolta, leap, leap over, leapfrog, long jump,
   lose altitude, mandibles, maxillae, meathooks, mitts, morris, mug,
   nails, negotiate, nippers, nose dive, nose-dive, overjump,
   overleap, overskip, palm, parachute, parachute jump, pincers,
   pitch, plop, plummet, plummeting, plump, plunge, plunk, pole vault,
   pounce on, pounce upon, pounces, pour down, power dive,
   precipitate, rain, rapids, running broad jump, running dive,
   running high jump, saut de basque, ski jump, skin-dive, skip,
   sky dive, sky-dive, sound, spring, spring upon, start, start aside,
   start up, stationary dive, steeplechase, stoop, strike, swan dive,
   swoop, swoop down, swoop down on, swoop down upon, take a header,
   take by surprise, talons, teeth, tour jete, trend downward,
   unguals, ungulae, updive, upleap, upspring, vault, waterfall