Thesaurus: bulbs

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