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bulbs
bulb (n.)
1.a rounded part of a cylindrical instrument (usually at one end)"the bulb of a syringe"
2.electric lamp consisting of a transparent or translucent glass housing containing a wire filament (usually tungsten) that emits light when heated by electricity
3.a rounded dilation or expansion in a canal or vessel or organ
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"
5.a modified bud consisting of a thickened globular underground stem serving as a reproductive structure
6.anything with a round shape resembling a teardrop
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Merriam Webster
BulbBulb (bŭlb), n. [L. bulbus, Gr. bolbo`s: cf. F. bulbe.]
1. (Bot.) 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.
2. (Anat.) A name given to some parts that resemble in shape certain bulbous roots; as, the bulb of the aorta.
Bulb of the eye, the eyeball. -- Bulb of a hair, the “root,” or part whence the hair originates. -- Bulb of the spinal cord, the medulla oblongata, often called simply bulb. -- Bulb of a tooth, the vascular and nervous papilla contained in the cavity of the tooth.
3. 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. Tomlinson.
3. a light bulb.
BulbBulb, v. i. To take the shape of a bulb; to swell.
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⇨ voir la définition de Wikipedia
bulb (n.)
electric light, electric-light bulb, globe, globule, incandescent lamp, lightbulb, light bulb, medulla, medulla oblongata, root, sphere
Voir aussi
⇨ Accessory Olfactory Bulb • Krause's bulb • Olfactory Bulb • Olfactory bulb • artery of the penis bulb • artery of the vestibule bulb • bulb grower • bulb vegetable • bulb-shaped • conjunctival layer of bulb • dry-bulb thermometer • duodenal bulb • electric-light bulb • flash bulb • incandescent bulb • lesser bulb fly • light bulb • olfactory bulb • vestibular bulb • wet bulb thermometer • wet-bulb thermometer • wet-bulb-thermometer
⇨ Albany Bulb • Artery of bulb of penis • Artery of bulb of vestibule • BBCH-scale (bulb vegetable) • Bulb (disambiguation) • Bulb (photography) • Bulb Records • Bulb Records discography • Bulb keel • Bulb of applied force • Bulb of penis • Bulb of percussion • Bulb to light all Ramat Gan • Bulb vegetable • Bus bulb • Dry-bulb temperature • Duodenal bulb • Eco bulb • Eco-bulb • Edible bulb • Energy saving bulb • Exploding light bulb • Flash Bulb Emergency Overflow Cavalcade of Remixes • Flash bulb • Flash bulb memories • Flower bulb • Fluorescent light bulb • Grow bulb • Grow-bulb • Halogen bulb • Halogen light bulb • Hangable Auto Bulb • Hot bulb engine • Incandescent light bulb • International Bulb Society • Light Bulb Joke • Light bulb joke • Light-bulb joke • Light-bulb jokes • Mazda (light bulb) • Metal halide light bulb • Olfactory bulb • The Floating Light Bulb • Tungsten-halogen bulb • Tungsten-halogen light bulb • Vein of bulb of penis • Vein of bulb of vestibule • Wet Bulb Globe Temperature • Wet-bulb potential temperature • Wet-bulb temperature
⇨ 1000 Bulbs • Bulbs (song) • Geobulb LED Bulbs • Longest-lasting light bulbs • Phase-out of incandescent light bulbs • Vestibular bulbs
bulb (n.)
bulb (n.)
lampe (appareil d'éclairage électrique) (fr)[Classe]
chose en verre (fr)[ClasseParExt.]
lampe (tube électrique) (fr)[Classe]
chose en forme de sphère (fr)[ClasseParExt.]
luminaire (fr)[DomainDescrip.]
electric lamp[Hyper.]
bulb (n.)
bulb (n.)
axe cérébro-spinal (fr)[DomainDescrip.]
bulb (n.)
chose en forme de sphère (fr)[ClasseParExt.]
(tearing out), (root)[termes liés]
dent (fr)[DomainDescrip.]
tige de la plante (fr)[DomainDescrip.]
poil (fr)[DomainDescrip.]
stalk, stem[Hyper.]
bulbaceous[Dérivé]
bulb (n.)
round shape[Hyper.]
bulblike, bulbous, bulb-shaped[Dérivé]
bulb (n.)
bulb[Hyper.]
Wikipedia - voir aussi
Wikipedia
A bulb is a short stem with fleshy leaves or leaf bases.[1] The leaves often function as food storage organs during dormancy.
A bulb's leaf bases, known as scales, generally do not support leaves, but contain food reserves to enable the plant to survive adverse conditions. At the center of the bulb is a vegetative growing point or an unexpanded flowering shoot. The base is formed by a stem, 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. Tunicate bulbs have dry, membranous outer scales that protect the continuous lamina of fleshy scales.[2] Species in the genera Allium, Hippeastrum, Narcissus, and Tulipa all have tunicate bulbs. Non-tunicate bulbs, such as Lilium and Fritillaria species, lack the protective tunic and have looser scales.[3]
Other types of storage organs (such as corms, rhizomes, and tubers) are sometimes erroneously referred to as bulbs. The technical term for plants that form underground storage organs, including bulbs as well as tubers and corms, is geophyte. Some epiphytic orchids (family Orchidaceae) form above-ground storage organs called pseudobulbs, that superficially resemble bulbs.
Nearly all plants that form true bulbs are monocotyledons, and include:
Oxalis, in the family Oxalidaceae, is the only dicotyledon genus that produces true bulbs.[4]
Bulbous plant species cycle through vegetative and reproductive growth stages; the bulb grows to flowering size during the vegetative stage and the plant flowers during the reproductive stage. Certain environmental conditions are needed to trigger the transition from one stage to the next, such as the shift from a cold winter to spring.[2]
Some lilies form small bulbs, called bulbils in their leaf axils. Several members of the onion family, Alliaceae, including Allium sativum (garlic), form bulbils in their flower heads, sometimes as the flowers fade, or even instead of the flowers. The so-called Tree onion (Allium cepa var. proliferum) forms small onions which are large enough for pickling.
Some ferns, such as Hen and Chicken Fern produce new plants at the tips of the fronds' pinnae, which are sometimes referred to as bulbils.
Bulbils form in the leaf axils of Lilium lancifolium
Wild garlic (Allium vineale) bulbils sprouting
"Tree onions" form clusters of small bulbs instead of flowers
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