pinocytosis
Concise Oxford English Dictionary © 2008 Oxford University Press:
pinocytosis /ˌpiːnəʊsʌɪˈtəʊsɪs, ˌpɪnəʊ-, ˌpʌɪnəʊ-/
▶noun Biology the ingestion of liquid into a cell by the budding of small vesicles from the cell membrane.
– origin C19: from Gk pino ‘drink’ + -cytosis on the pattern of phagocytosis.
'pinocytosis' also found in these Oxford entries:

