1. • noun - a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
   • noun - electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity
   • noun - a rounded part of a cylindrical instrument (usually at one end)
   • noun - anything with a round shape resembling a teardrop
   • noun - lower or hindmost part of the brain
   • noun - a rounded dilation or expansion in a canal or vessel or organ
2. • Botany.
   • A short, modified, underground stem surrounded by usually fleshy modified leaves that contain stored food for the shoot within: an onion bulb; a tulip bulb.
   • A similar underground stem or root, such as a corm, rhizome, or tuber.
   • A plant that grows from a bulb.
   • A rounded projection or part: the bulb of a syringe.
   • An incandescent lamp or its glass housing.
   • A rounded dilation or expansion of a canal, vessel, or organ.
3. • adj - an underground bud [n -S] : BULBAR, BULBED

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