| ulna |
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noun (ulnae, pl2=ulnas)
- (anatomy) The postaxial bone of the forearm, or branchium, corresponding to the fibula of the hind limb.
| | | 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.
| | underbelly |
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noun (underbellies)
- (figuratively) The side which is not normally seen
- The area by the canal is the underbelly of town - not something you'd see in the guidebooks
| | undergrowth |
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noun
- those plants in a forest which only reach a relatively low height (such as shrubs and bushes)
| | ungulate |
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noun - an ungulate animal; a hooved animal
- The majority of large land mammals are ungulates.
adjective - having hoof, hooves
| | urochord |
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noun - (biology) a notochord that is limited to the caudal region; especially in the Urochordata
- any marine organism of the Urochordata
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