U
chemical symbol, uranium; unit; uracil.
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U wave
seen in the human electrocardiogram; represents repolarization of Purkinje cells.
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U.D.
Utility Dog; the highest level degree or title, after C.D. and C.D.X., awarded in obedience trial competition.
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U/V rays
see ultraviolet rays.
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UAA
ochre codon, one of the three stop codons.
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UAG
amber codon, one of the three stop codons.
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uakari
small, 2 ft, short, bushy-tailed, bald-faced New World monkey; brightly colored. Called also Cacajao spp.
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Uasin gishu disease
a viral disease of horses in Kenya. Highly contagious, large lesions and a generalized cutaneous eruption with a pathology similar to that of molluscum contagiosum of humans. There is a poxvirus similar to vaccinia associated with the disease.
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Uberreiter’s syndrome
see chronic superficial keratitis.
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ubiquinol
the form of ubiquinone when reduced by two electrons.
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