(noun, verb)


1. a modified bud consisting of a thickened globular underground stem serving as a reproductive structure

Definition categories: plant, stalk, stem

2. electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity

Similar word(s): lightbulb

Definition categories: man–made

3. a rounded part of a cylindrical instrument (usually at one end)

- the bulb of a syringe

Definition categories: man–made, part, portion

4. anything with a round shape resembling a teardrop

Definition categories: shape

5. lower or hindmost part of the brain; continuous with spinal cord; (`bulb' is an old term for medulla oblongata)

Similar word(s): medulla

Definition categories: body

6. a rounded dilation or expansion in a canal or vessel or organ

Definition categories: body, structure

Sentences with bulb as a noun:

- the bulb of the aorta


1. (intransitive) To take the shape of a bulb; to swell.