Process by which certain cells can engulf and incorporate droplets of fluid WordNet 3.0 & Open English WordNet

In cellular biology, pinocytosis, otherwise known as fluid endocytosis and bulk-phase pinocytosis, is a mode of endocytosis in which small molecules dissolved in extracellular fluid are brought into the cell through an invagination of the cell membrane, resulting in their containment within a small vesicle inside the cell. Wikipedia

Endocytosis process that results in the uptake of liquid by cells Wikidata

A form of endocytosis in which material enters a cell through its membrane and is incorporated in vesicles for digestion. Wiktionary

A form of endocytosis. Wiktionary (translation)