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Definition of BULB
a: a resting stage of a plant (as the lily, onion, hyacinth, or tulip) that is usually formed underground and consists of a short stem base bearing one or more buds enclosed in overlapping membranous or fleshy leaves
b: a fleshy structure (as a tuber or corm) resembling a bulb in appearance
c: a plant having or developing from a bulb
: a bulb-shaped part; specifically: a glass envelope enclosing the light source of an electric lamp or such an envelope together with the light source it encloses
: a rounded or swollen anatomical structure
: a camera setting that indicates that the shutter can be opened by pressing on the release and closed by ending the pressure
In botany, the resting stage of certain seed plants, particularly perennial monocotyledons (seecotyledon), consisting of a relatively large, usually globe-shaped, underground bud with membranous or fleshy overlapping leaves arising from a short stem. The fleshy leaves function as food reserves that enable a plant to lie dormant when water is unavailable (during winter or drought) and to resume active growth when favourable conditions again prevail. There are two main types of bulbs. One, typified by the onion, has a thin papery covering protecting its fleshy leaves. The other, the scaly bulb, as seen in true lilies, has naked storage leaves, with no papery covering, making the bulb appear to consist of angular scales. Bulbs enable many common ornamentals, such as the narcissus, tulip, and hyacinth, to flower rapidly in early spring when growing conditions are favourable. Other bulb-producing plants bloom in the summer (e.g., lilies) or fall (e.g., the autumn crocus). The solid corms of the crocus and gladiolus and the elongated rhizomes of some irises are not bulbs.