Roget's Thesaurus

#252. Concavity

Nouns

concavity, depression, dip; hollow, hollowness; indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus, lacuna; excavation, strip mine; trough etc. (furrow) 259; honeycomb. cup, basin, crater, punch bowl; cell etc. (receptacle) 191; socket. valley, vale, dale, dell, dingle, combe, bottom, slade, strath, glade, grove, glen, cave, cavern, cove; grot, grotto; alcove, cul-de-sac; gully etc. 198; arch etc. (curve) 245; bay etc. (of the sea) 343. excavator, sapper, miner. honeycomb (sponge) 252a.

Verbs

be concave etc. adj.; retire, cave in. render concave etc. adj.; depress, hollow; scoop, scoop out; gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.

Adjectives

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

#252a Sponge

Nouns

sponge, honeycomb, network; frit [Chem], filter. sieve, net, screen (opening) 260.

Adjectives

cellular, spongy, spongious; honeycombed, alveolar; sintered; porous (opening) 260.