| Orifice (n.) A mouth or aperture, as of a tube, pipe, etc.; an opening; as, the orifice of an artery or vein; the orifice of a wound. Thesaurus Entries aperture, broaching, cavity, chasm, check, clearing, cleft, crack, disclosure, fenestra, fistula, fontanel, foramen, gap, gape, gat, gulf, hiatus, hole, hollow, inlet, interval, lacuna, laying open, leak, opening, opening up, outlet, passageway, pore, slot, space, split, stoma, throwing open, uncorking, unstopping, vent, yawn |