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[ek-soh-sahy-toh-sis] /ˌɛk soʊ saɪˈtoʊ sɪs/
noun, Physiology.
the transport of material out of a cell by means of a sac or vesicle that first engulfs the material and then is extruded through an opening in the cell membrane (distinguished from endocytosis).
Origin of exocytosis
1960-65; exo- + -cyte + -osis; cf. endocytosis
Related forms
[ek-soh-sahy-tot-ik] /ˌɛk soʊ saɪˈtɒt ɪk/ (Show IPA),
adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for exocytosis


a process by which material is exported from a biological cell
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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exocytosis in Medicine

exocytosis ex·o·cy·to·sis (ěk'sō-sī-tō'sĭs)
n. pl. ex·o·cy·to·ses (-sēz')

  1. The appearance of migrating inflammatory cells in the epidermis.

  2. 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. Also called emiocytosis.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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