Category: V
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Villus
(More specifically) long soft unmatted hair. Villi, one of many tiny projections, containing capillaries and a lacteal, occurring over the mucous membrane of the small intestine that function in the absorption of nutrients and fluids. A tiny hair-like or fingerlike vascular projection present on a mucous membrane. Villi are present in all three sections of…
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Villose, villous
With long soft weak hairs (villose is preferable but seems to be used only rarely). Shaggy; the hairs long, slender, soft, but not matted. Shaped like a villus, or formed of villi.
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Vicariant event
Mode of speciation in which a barrier, such as water or mountains, divides members of a species, the vicariants then evolve separately.
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Vicariant
Taxa descended from a common ancestor but now occurring in disjunct parts of the world, often occupying the same niche.
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Viable
(Of seed) capable of germination. In embryology, a fetus capable of living outside of the mother. Referring to a fetus which can survive if born. The medical term for an infant who is capable of living, growing, and developing independently. Normally, that means that the infant weighs at least 2.2 pounds (1,000 grams) at birth…
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Vexillum
The uppermost or posterior petal of a papilionaceous flower. The standard of a papillionaceous flower.
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Vexillary stamen
Upper stamen in diadelphous papilionaceous flower (formula usually 9+1 stamens), which is free or partially attached.
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Vesture, vestiture
Anything on or arising from a surface that makes it non-glabrous: hairs, scales, papillae, glands etc.
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Vestite
Clothed or covered.
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Vestigial
As a remnant, a very small version of an organ or organ part, appearing not to serve its original function. A small or imperfectly developed bodily part or organ that remains from one more fully developed in an earlier stage of the person, or in a past generation, or in closely related forms. Existing in…