bulb - definition, thesaurus and related words from WordNet-Online

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Noun bulb has 5 senses

bulb - a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
--₁ is a kind of stalk, stem
--₁ has particulars: onion; shallot; squill; bulbil, bulblet
light bulb, lightbulb, bulb, incandescent lamp, electric light, electric-light bulb - electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
--₂ is a kind of electric lamp
--₂ has parts: filament
bulb - a rounded part of a cylindrical instrument (usually at one end); "the bulb of a syringe"
--₃ is a kind of part, portion
--₃ is a part of mercury thermometer, mercury-in-glass thermometer; syringe
medulla oblongata, medulla, bulb - lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata); "the medulla oblongata is the most vital part of the brain because it contains centers controlling breathing and heart functioning"
--₄ is a kind of neural structure
--₄ is a part of brainstem, brain-stem, brain stem
--₄ has parts: respiratory center
bulb - a rounded dilation or expansion in a canal or vessel or organ
--₅ is a kind of structure, anatomical structure, complex body part, bodily structure, body structure