THESAURUS
concavity
aduncity, alveolation, alveolus, antrum, aquilinity, arching, arcuation, armpit, basin, boss, bowl, bump, cavity, circularity, colophon, concameration, concave, convexity, convolution, crater, crookedness, crypt, cup, curvation, curvature, curving, curvity, dactylogram, dactylograph, de-escalation, debasement, decurvation, decurvature, degradation, demotion, dent, depression, descent, detrusion, diminution, dint, dip, ducking, embossment, excrescence, excurvation, excurvature, fingerprint, fold, follicle, footmark, footprint, footstep, fossil footprint, funnel chest, hauling down, hole, hollow, hollow shell, hollowness, hookedness, ichnite, ichnolite, impress, impression, imprint, incurvation, incurvature, incurvity, indent, indentation, indention, lacuna, lowering, lump, pad, paw print, pawmark, pimple, pit, pocket, print, pug, pugmark, punch bowl, recurvation, recurvature, recurvity, reduction, rondure, rotundity, sag, scoop, seal, shell, sigil, signet, sink, sinkage, sinkhole, sinking, sinuosity, sinuousness, sinus, socket, stamp, step, stud, submergence, thrusting under, thumbmark, thumbprint, tortuosity, tortuousness, trough, vaulting, vestige, vug
ROGET THESAURUS
concavity
Concavity
N
concavity, depression, dip, hollow, hollowness, indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus, lacuna, excavation, strip mine, trough, honeycomb, cup, basin, crater, punch bowl, cell, socket, valley, vale, dale, dell, dingle, combe, bottom, slade, strath, glade, grove, glen, cave, cavern, cove, grot, grotto, alcove, cul-de- sac, gully, arch, bay, excavator, sapper, miner, honeycomb (sponge), depressed, alveolate, calathiform, cup-shaped, dishing, favaginous, faveolate, favose, scyphiform, scyphose, concave, hollow, stove in, retiring, retreating, cavernous, porous, infundibul, infundibular, infundibuliform, funnel shaped, bell shaped, campaniform, capsular, vaulted, arched.