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bulb (n.)

1560s, "an onion," from French bulbe (15c.), from Latin bulbus "bulb, bulbous root, onion," from Greek bolbos "plant with round swelling on underground stem." Extended 1660s to "spherical underground part of an onion, lily, etc." Expanded by 1800 to "swelling in a glass tube" (thermometer bulb, light bulb, etc.).

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Definitions of bulb from WordNet

bulb (n.)
a modified bud consisting of a thickened globular underground stem serving as a reproductive structure;
bulb (n.)
electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity;
Synonyms: light bulb / lightbulb / incandescent lamp / electric light / electric-light bulb
bulb (n.)
a rounded part of a cylindrical instrument (usually at one end);
the bulb of a syringe
bulb (n.)
anything with a round shape resembling a teardrop;
bulb (n.)
lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata);
Synonyms: medulla oblongata / medulla
bulb (n.)
a rounded dilation or expansion in a canal or vessel or organ;
From wordnet.princeton.edu