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 ).

1960–65; exo- + -cyte + -osis; cf. endocytosis

exocytotic [ek-soh-sahy-tot-ik] , adjective
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World English Dictionary
exocytosis (ˌɛksəʊsaɪˈtəʊsɪs)
a process by which material is exported from a biological cell

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American Heritage
Medical Dictionary

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.

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Example sentences
Rapid reaction suggests that protein might be abundantly present and the secretion by exocytosis might be important.
Diatoms already secrete silica by exocytosis-a biological process by which cells direct secreted material outside the cell walls.
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