Meaning

noun a modified bud consisting of a thickened globular underground stem serving as a reproductive structure

noun electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity

noun a rounded part of a cylindrical instrument (usually at one end)

originEtymology tree Ancient Greek βολβός (bolbós)bor. Latin bulbusder. English bulb Inherited from Middle English bulb, bolbe, from Latin bulbus (“bulb, onion”), from Ancient Greek βολβός (bolbós, “plant with round swelling on underground stem”).

Etymology from Wiktionary, CC BY-SA 3.0