pinocytosis

noun

pi·​no·​cy·​to·​sis ˌpi-nə-sə-ˈtō-səs How to pronounce pinocytosis (audio)
ˌpī-,
-ˌsī-
: the uptake of fluid and dissolved substances by a cell by invagination and pinching off of the cell membrane

Word History

Etymology

New Latin, from Greek pinein to drink + New Latin cyt- + -osis — more at potable

First Known Use

1895, in the meaning defined above

Time Traveler
The first known use of pinocytosis was in 1895

Browse Nearby Words

Cite this Entry

“Pinocytosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pinocytosis. Accessed 3 Apr. 2025.

Medical Definition

: the uptake of fluid and dissolved substances by a cell by invagination and pinching off of the cell membrane

More from Merriam-Webster on pinocytosis

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!