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urticate

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(ŭrt′ĭ-kāt″) [L. urticare, to sting] 1. To produce urticaria. 2. Marked by the appearance of wheals.

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urushiol

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(ū-roo′shē-ol″) [Japanese urushi, lac + -ol] The principal toxic irritant substance of plants such as poison ivy, which produces characteristic severe dermatitis on contact.

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US

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ultrasound;. undetermined significance.

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usability

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(ūz″ă-bil′ĭt-ē) A design characteristic pertaining to the ease with which people can employ tools and processes to perform goal-related tasks. Included in the characteristics are elements such as ease of learning, recall, satisfaction, and efficiency.

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USAEC

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United States Atomic Energy Commission.

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USAN

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United States Adopted Names (for drugs).

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USAN and the USP Dictionary of Drug Names

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A dictionary of nonproprietary names, brand names, code designations, and Chemical Abstracts Service registry numbers for drugs. SEE: United States Adopted Names.

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USCOM

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[Acronym for u(ltra)s(onic) c(ardiac) o(utput) m(onitor)] A noninvasive device that measures cardiac output.

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USDA

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United States Department of Agriculture.

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USDA organic

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A USDA designation for food that specifies that 95% of its components are organic.

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use of force

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Interpersonal violence, esp. by police officers, members of the military, or other authorized members of the legal system or the state.

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usenet

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(ūz′net″) A worldwide collection of user-submitted notes or messages on various subjects that are posted to servers on the Internet.

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Usher syndrome

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(ŭsh′ĕr) [Charles Howard Usher, Brit. ophthalmologist, 1865–1942] An autosomal recessive disorder marked by a combination of congenital sensorineural deafness and retinitis pigmentosa that results in a gradual loss of vision. One variant of the syndrome also interferes with normal balance. SEE: retinitis pigmentosa.

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USP, US Phar

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United States Pharmacopeia; United States Pharmacopeial Convention, Inc.

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USPHS

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United States Public Health Service.

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USP-NF

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United States Pharmacopeia–National Formulary.

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USPRA

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United States Psychiatric Rehabilitation Association.

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USPSTF

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United States Preventive Services Task Force.

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Ustilago

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(ŭs-tĭ-lā′gō) [L. ustilago, the name of a plant] A genus of approx. 200 parasitic fungi, esp. U. maydis, that form powdery, black masses of spores (smut) on cereal plants and make them unfit to eat.

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uta

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(oot′ă) [A local name in Peru] American leishmaniasis.

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Utah Elbow

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(ū′tah) A myoelectric prosthesis that uses an electrode and microprocessors to control both ...

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