| umbel |
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noun - A flat-topped or rounded flower-cluster (= inflorescence) in which the individual flower stalks arise from the same point, the youngest flowers being at the centre.
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| umbellet |
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noun - a secondary umbel in a compound umbel such as the carrot; an umbellule
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| umbelliferous |
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adjective
- (botany) bearing umbels
- (botany) pertaining to a member of the family Umbelliferae
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| umbo |
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noun (plural umbones or umbos)
- (Armor) The boss of a shield, at or near the middle, and usually projecting, sometimes in a sharp spike.
- Quotations
- 1786: It is thirteen inches diameter, made of wood covered with leather, and an iron plate decorated with nails and mouldings; the boss or umbo projects four inches. — Francis Grose, A Treatise on Ancient Armour and Weapons, page xii.
- A boss, or rounded elevation, or a corresponding depression, in a palate, disk, or membrane; as, the umbo in the integument of the larví¦ of echinoderms or in the tympanic membrane of the ear.
- (zoology) One of the lateral prominence just above the hinge of a bivalve shell.
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| underbrush |
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noun - The small trees and other plants that clutter the floor of a forest.
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| undergrowth |
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noun
- those plants in a forest which only reach a relatively low height (such as shrubs and bushes)
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| Underwood |
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proper noun
- an English and Scottish topographic surname for someone who lived near a wood
- a habitational surname for someone who lived in several places with that name in England and Scotland
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| unripe |
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adjective
- Not ripe; as, unripe fruit.
- Developing too early; premature.
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| urceolate |
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adjective ur.ce.o.la.te
- (botany) Shaped like an urn: an urceolate corolla.
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| urn |
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noun
- a vase with a footed base
- a metal vessel for serving tea or coffee
- a vessel for ashes or cremains of a deceased person
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| urticant |
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noun
- Such a substance.
adjective
- Causing itching or stinging.
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