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Dictionary definition for: Bulb
1. (n) a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
2. (n) electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
3. (n) a rounded part of a cylindrical instrument (usually at one end) "the bulb of a syringe"
4. (n) 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"
5. (n) a rounded dilation or expansion in a canal or vessel or organ
WordNet 2.1 Copyright Princeton University. All rights reserved.
