bulb

n. light bulb, lamp; tuber, glomus, swollen anatomical structure (Anatomy); short and round stem that is usually underground (Botany); plant that grows from a bulb (Botany)

A bulb is an underground vertical shoot that has modified leaves (or thickened leaf bases) that are used as food storage organs by a dormant plant. A bulb's leaf bases generally do not support leaves, but contain food reserves to enable the plant to survive adverse conditions. The leaf bases may overlap and surround the center of the bulb as with lilies, or may completely surround the inner regions of the bulb, as with the onion. A modified stem forms the base of the bulb, and plant growth occurs from this basal plate. Roots emerge from the underside of the base, and new stems and leaves from the upper side.
See more at Wikipedia.org...

Noun
1. a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
(hypernym) stalk, stem
(hyponym) onion
2. electric lamp consisting of a glass bulb containing a wire filament (usually tungsten) that emits light when heated
(synonym) light bulb, lightbulb, incandescent lamp, electric light, electric-light bulb
(hypernym) electric lamp
(part-meronym) filament
3. a rounded part of a cylindrical instrument (usually at one end); "the bulb of a syringe"
(hypernym) part, portion
(part-holonym) mercury thermometer, mercury-in-glass thermometer
4. 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"
(synonym) medulla oblongata, medulla
(hypernym) neural structure
(part-holonym) brainstem, brain-stem, brain stem
(part-meronym) respiratory center
5. a rounded dilation or expansion in a canal or vessel or organ
(hypernym) structure, anatomical structure, complex body part, bodily structure, body structure

(v. i.)
To take the shape of a bulb; to swell.
  

(n.)
An expansion or protuberance on a stem or tube, as the bulb of a thermometer, which may be of any form, as spherical, cylindrical, curved, etc.
  

(n.)
A spheroidal body growing from a plant either above or below the ground (usually below), which is strictly a bud, consisting of a cluster of partially developed leaves, and producing, as it grows, a stem above, and roots below, as in the onion, tulip, etc. It differs from a corm in not being solid.
  

(n.)
A name given to some parts that resemble in shape certain bulbous roots; as, the bulb of the aorta.
  

bot. bulb(ous root)
anat. bulbbulb de păr = bulb / root of a hair
bulb dentar = root of a tooth
bulbul ochiului = the eye ball
bulbul ochiului = the globe of the eye