| tuber |
An enlarged, underground stem.
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| tympanum |
In frogs and toads, the round hearing organ on the sides of their heads.
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| umbel |
A flower cluster with flower stalks radiating from a single point.
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| umbels |
Plural of umbel.
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| umbilicus |
In snails, the depression or hole at the center of the shell's whorls.
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| undertail coverts |
The undertail coverts are the feathers just before the tail feathers on the under side of the bird.
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| universal veil |
A layer of tissue that covers the entire mushroom during the initial stages of development.
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| uppertail coverts |
The uppertail coverts are the feathers between the rump and the tail on the upperside of the bird.
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| ventral |
Referring to the underside of an insect or the underside of the wing of an insect.
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| volva |
The cup-like remains of universal veil tissue around the base of the mushroom stalk.
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| wattle |
The wattle is a fleshy growth hanging from the neck or head.
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| whorled |
When pertaining to leaves - three or more leaves from the same node on a stem.
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| winter annual |
The seeds sprout during the summer, over-winter underground and complete their life cycle the next growing season.
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| WLC |
Gilbert M. and Martha H. Hitchcock Wetlands Learning Cemter
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| woody |
When pertaining to plants, persisting through winter; i.e. not dying back like herbs.
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