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) 252a

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

Adj. depressed, cellular, alveolate, spongy, calathiform, spongious, cup-shaped, honeycombed, dishing, alveolar, favaginous, sintered, faveolate, porous (opening) 260, favose, scyphiform, scyphose, concave, hollow, stove in, retiring, retreating, cavernous, porous, infundibul, infundibular, infundibuliform, funnel shaped, bell shaped, campaniform, capsular, vaulted, arched, 252a sponge—n, sponge, honeycomb, network, frit, filter, sieve, net, screen (opening) 260