[1] : The Collaborative International Dictionary of English v.0.48

cavity \cav"ity\, n.; pl. cavities. l. cavus hollow: cf. f.
   cavit'e.
   1. hollowness. obs.
      1913 webster

            the cavity or hollowness of the place. --goodwin.
      1913 webster

   2. a hollow place; a hollow; as, the abdominal cavity.
      1913 webster

            an instrument with a small cavity, like a small
            spoon.                                --arbuthnot.
      1913 webster

            abnormal spaces or excavations are frequently formed
            in the lungs, which are designated cavities or
            vomicae.                            --quain.
      1913 webster

   body cavity, the coelum. see under body.
      1913 webster
see also:
cavities body cavity body 

[2] : WordNet (r) 2.0

cavity
     n 1: a sizeable hole usually in the ground; "they dug a pit to
          bury the body" syn: pit
     2: space that is surrounded by something syn: enclosed space
     3: soft decayed area in a tooth; progressive decay can lead to
        the death of a tooth syn: caries, dental caries, tooth
        decay
     4: anatomy a natural hollow or sinus within the body syn: bodily
        cavity, cavum
see also:
pit enclosed space caries dental caries tooth decay bodily cavity 
cavum 

[3] : Moby Thesaurus II by Grady Ward, 1.0

142 moby thesaurus words for "cavity":
   abysm, abyss, alveolation, alveolus, antrum, aperture, armpit,
   arroyo, basin, booth, bowl, box, box canyon, breach, break,
   broaching, canyon, cell, cellule, chamber, chap, chasm, check,
   chimney, chink, clearing, cleft, cleuch, clough, col, compartment,
   concave, concavity, coulee, couloir, crack, cranny, crater,
   crevasse, crevice, crib, crypt, cup, cut, cwm, deep, defile, dell,
   depression, depth, dike, dip, disclosure, ditch, donga, draw,
   enclosed space, excavation, fault, fenestra, fissure, fistula,
   flaw, flume, fold, follicle, fontanel, foramen, fracture,
   funnel chest, furrow, gap, gape, gash, gat, gorge, groove, gulch,
   gulf, gully, hiatus, hold, hole, hollow, hollow shell, incision,
   inlet, interval, joint, kloof, lacuna, laying open, leak, manger,
   moat, notch, nullah, opening, opening up, orifice, outlet, pass,
   passage, passageway, pew, pit, pocket, pore, punch bowl, ravine,
   rent, rift, rime, rupture, scissure, scoop, seam, shaft, shell,
   sink, sinus, slit, slot, socket, space, split, stall, stoma,
   throwing open, trench, trough, uncorking, unstopping, vacuity,
   valley, vault, void, vug, wadi, well, yawn, yawning abyss

Cavity >> C Words
Cavity, definition of term: Cavity
cavity_pag1.html

Tympanic Cavity >> T Words
Tympanic Cavity, definition of term: Tympanic Cavity
tympanic+cavity_pag1.html

Thoracic Cavity >> T Words
Thoracic Cavity, definition of term: Thoracic Cavity
thoracic+cavity_pag1.html

Buccal Cavity >> B Words
Buccal Cavity, definition of term: Buccal Cavity
buccal+cavity_pag1.html