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(ī″sō-tō-nĭs′ĭ-tē) The state or condition of being isotonic.
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(ī′sŏ-tōp″) [iso- + Gr. topos, place (chemical isotopes occupy the same place on the periodic table)] One of a series of chemical elements that have nearly identical chemical properties but different atomic weights and electric charges. Many isotopes are radioactive.
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radioactive i. An isotope in which the nucleus is unstable and emits ionizing radiation such as gamma rays. SEE: table.
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stable i. An isotope that does not undergo radioactive decay into another element.
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(ī″sō-tret″ĭ-nō′ĭn) [iso- + tretinoin] A keratolytic agent used in treating acne.
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This medicine should not be used by pregnant women or women who are sexually active and at risk of becoming pregnant.
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(ī″sō-trŏp′ĭk) [″ + tropos, a turning] 1. Possessing similar qualities in every direction. 2. Having equal refraction.
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(ī-sŏt′rō-pē) The state of being isotropic.
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(ī′sō-tīp) In immunology, one of the determinants on the immunoglobulin molecule that distinguish among the main classes of antibodies of a given species. They are the same for all normal individuals of that species. SEE: idiotype.
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immunoglobulin i. Immunoglobulin fragment.
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(ī-sō-tĭp′ĭ-kăl) [″ + typos, mark] Belonging to the same variety or classification.
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(is″pă-goo′lă, is′pă-gool″, is′pă-gŭl″) Any of several plants of the genus Plantago, esp. P. ovata, whose seeds are used as a bulk laxative. SEE: Plantago; psyllium.
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(ĭsh′ū) [ME.] 1. Offspring. 2. A suppurating sore maintained by a foreign body in the tissue to act as a counterirritant. 3. A discharge ...