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picture , pic·ture / ˈpikchər/ • n. a painting or drawing: draw a picture of a tree. ∎ a photograph: we were warned not to take pictures. ∎ a portrait: have he… Release , re·lease / riˈlēs/ • v. [tr.] 1. allow or enable to escape from confinement; set free: the government announced that the prisoners would be released.… Parasympathetic Nervous System , parasympathetic nervous system Part of the autonomic nervous system. Its nerve endings release acetylcholine as a neurotransmitter and its actions te… Sympathetic Nervous System , sympathetic nervous system That part of the autonomic nervous system which generally acts to stimulate the body to cope with stress, such as increasi… System , sys·tem / ˈsistəm/ • n. 1. a set of connected things or parts forming a complex whole, in particular: ∎ a set of things working together as parts of… Rf , Rf • symb. the chemical element rutherfordium.
rf, rfz. = rinforzando.
RF n. see rheumatic fever.
RF See release factor.
rf reef
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