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phos·pha·ti·dyl .fäs-fə-'tīd-əl, fäs-'fat-əd-əl n any of several monovalent groups (RCOO)2C3H5OPO(OH) that are derived from phosphatidic acids
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phos·pha·ti·dyl (fos″fə-tiґdəl) a term denoting a compound containing a phosphatidic acid group; used also as a prefix to denote such a compound.Medical dictionary. 2011.