ex·o·cy·to·sis (ěk'sō-sī-tō'sĭs) n.
pl.ex·o·cy·to·ses (-sēz') A process of cellular secretion or excretion in which substances contained in vesicles are discharged from the cell by fusion of the vesicular membrane with the outer cell membrane. ex'o·cy·tose' (-tōs') v., ex'o·cy·tot'ic (-tŏt'ĭk) adj.