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| any of the four haploid cells formed by the two consecutive meiotic divisions of a primary spermatocyte, each of which develops into a spermatozoon |
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| a person given a discharge from the armed forces because of military unsuitability, esp. psychological unfitness |
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| the phenomenon of electron or ion emission from the heated surface of a conductor |
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| the lowest area of the ionosphere, having increased ion density and existing only in the daytime: it begins at an altitude of about 43 mi and merges with the E layer |
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| a condition in the contracts of professional baseball players, allowing team owners to extend expired contracts for one additional year |
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| a synthetic, bitter-tasting, crystalline narcotic, C15H21NO2, used as a sedative and analgesic |
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| a short horizontal bar, hung at a height by two ropes, on or from which gymnasts or circus aerialists swing, performing various stunts |
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| the antiparticle of a neutron, with the same mass and spin as the neutron, but with a positive magnetic moment (the neutron has a negative magnetic moment) |
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| a small tree frog (Hyla crucifer) of the E U.S., that makes shrill, peeping sounds in early spring |
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| a glyceryl ester, C3H5(C4H7O2)3, of butyric acid |
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