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1 a: the placing of air or dissolved gases in intimate contact with the circulating medium of a multicellular organism (as by breathing) b: a single complete act of breathing2: the physical and chemical processes by which an organism supplies its cells and tissues with the oxygen needed for metabolism and relieves them of the carbon dioxide formed in energy-producing reactions3: any of various energy-yielding oxidative reactions in living matter
— re·spi·ra·to·ry
\ˈres-p(ə-)rə-ˌtȯr-ē, ri-ˈspī-rə-\
adjective
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