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Bulb

Definition

[n] a rounded part of a cylindrical instrument (usually at one end); "the bulb of a syringe"
[n] electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
[n] a rounded dilation or expansion in a canal or vessel or organ
[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"
[n] a modified bud consisting of a thickened globular underground stem serving as a reproductive structure

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