Occurring in or characterized by two phases or stages.
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a) exhibiting a stage of stimulation followed by a stage of depression or vice versa <the \diphasic action of certain drugs>
b) relating to or being a record of a nerve impulse that is negative and positive <a \diphasic action potential> compare MONOPHASIC (1), POLYPHASIC (1)
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di·pha·sic (di-faґzik) [di- + Gr. phasis phase] occurring in two phases or stages. Cf. monophasic and triphasic.Medical dictionary. 2011.