n. A diver; one who plunges and sinks in water, as in search of pearls.n. [capitalized] [NL. (Cuvier,1800;Lacépède,1801).] A genus of diving birds, giving name to the Urinatoridæ: variously applied.n. Qnite recently the name was revived, and definitely restricted to the loons, whose usual generic name, Colymbus, was thereupon transferred to certain grebes. See Colymbus, and cuts under loon and tibia.