cavity

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

Cavity \Cav"i*ty\, n.; pl. {Cavities}. [L. cavus hollow: cf. F.
   cavit['e].]
   1. Hollowness. [Obs.]
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            The cavity or hollowness of the place. --Goodwin.
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   2. A hollow place; a hollow; as, the abdominal cavity.
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            An instrument with a small cavity, like a small
            spoon.                                --Arbuthnot.
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            Abnormal spaces or excavations are frequently formed
            in the lungs, which are designated cavities or
            vomic[ae].                            --Quain.
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   {Body cavity}, the c[oe]lum. See under {Body}.
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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