Div'er, n.

n. 1. One who dives; one who plunges head first into water; one who sinks by effort; as, a diver in the pearl fishery.

2. One who goes deeply into a study or business.
3. (Ornith.) A bird of certain genera, remarkable for their habit of diving, as Colymbus, or of the allied family Podicipinæ; the northern diver, Colymbus glacialis.