Roget's Thesaurus: Entry 252 (Concavity)

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#252. Concavity. -- N. concavity, depression, dip; hollow, hollowness; indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus[obs], lacuna; excavation, strip mine; trough &c. (furrow) 259; honeycomb.

cup, basin, crater, punch bowl; cell &c. (receptacle) 191; socket.

valley, vale, dale, dell, dingle, combe[obs], bottom, slade[obs], strath[obs], glade, grove, glen, cave, cavern, cove; grot[obs], grotto; alcove, cul-de-sac; gully &c. 198; arch &c. (curve) 245; bay &c. (of the sea) 343.

excavator, sapper, miner.

honeycomb (sponge) 252a.

V. be concave &c. adj.; retire, cave in.

render concave &c. adj.; depress, hollow; scoop, scoop out; gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.

Adj. depressed &c. v.; alveolate[obs], calathiform[obs], cup-shaped, dishing; favaginous[obs], faveolate[obs], favose[obs]; scyphiform[obs], scyphose[obs]; concave, hollow, stove in; retiring; retreating; cavernous; porous &c. (with holes) 260; infundibul[obs], infundibular[obs], infundibuliform[obs]; funnel shaped, bell shaped; campaniform[obs], capsular; vaulted, arched.

252a Sponge -- N. sponge, honeycomb, network; frit[Chem], filter.

sieve, net, screen (opening) 260.

Adj. cellular, spongy, spongious[obs]; honeycombed, alveolar; sintered; porous (opening) 260.