Lacuna1. (n.) A small opening; a small pit or depression; a small blank space; a gap or vacancy; a hiatus.
2. (n.) A small opening; a small depression or cavity; a space, as a vacant space between the cells of plants, or one of the spaces left among the tissues of the lower animals, which serve in place of vessels for the circulation of the body fluids, or the cavity or sac, usually of very small size, in a mucous membrane.
Thesaurus Entries
alveolation, alveolus, antrum, aperture, armpit, arrearage, basin, bowl, breach, break, broaching, caesura, cavity, cessation, chasm, check, clearance, clearing, cleft, concave, concavity, crack, crater, crypt, cup, defalcation, defect, deficiency, deficit, depression, dip, disclosure, discontinuity, distance between, double space, em space, en space, fenestra, fissure, fistula, fold, follicle, fontanel, foramen, freeboard, funnel chest, gap, gape, gat, gulf, hair space, half space, hiatus, hole, hollow, hollow shell, inlet, interim, intermediate space, intermission, interruption, interspace, interstice, interval, jump, lack, laying open, leak, leap, leeway, letup, lull, margin, missing link, need, omission, opening, opening up, orifice, outage, outlet, passageway, pause, pit, pocket, pore, punch bowl, room, scoop, shell, shortage, single space, sink, sinus, slot, socket, space, space between, split, stoma, suspension, throwing open, time interval, trough, ullage, uncorking, unstopping, vug, want, wantage, yawn