[pin-uh-sahy-toh-sis, pahy-nuh-]

noun Physiology.

the transport of fluid into a cell by means of local infoldings by the cell membrane so that a tiny vesicle or sac forms around each droplet, which is then taken into the interior of the cytoplasm.

Origin of pinocytosis

1931; < Greek pín(ein) to drink + -o- + -cyte + -osis, on the model of phagocytosis
Related formspin·o·cy·tot·ic [pin-uh-sahy-tot-ik, pahy-nuh-] /ˌpɪn ə saɪˈtɒt ɪk, ˌpaɪ nə-/, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Word Origin and History for pinocytosis

from Greek pinein "to drink" (see imbibe) + -cytosis.

Online Etymology Dictionary, © 2010 Douglas Harper

pinocytosis in Medicine


[pĭn′ə-sĭ-tōsĭs, -sī-, pī′nə-]


Introduction of fluids into a cell by invagination of the cell membrane, followed by formation of vesicles within the cells.
Related formspin′o•cy•totic (-tŏtĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.