Cavity

n.	1.	Hollowness. The cavity or hollowness of the place. - Goodwin.
	2.	A hollow place; a hollow; as, the abdominal cavity. An instrument with a small cavity, like a small spoon - Arbuthnot. Abnormal spaces or excavations are frequently formed in the lungs, which are designated cavities or vomicæ. - Quain. Body cavity the cœlum. See under Body.

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

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, 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, 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

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