micropinocytosis

noun

mi·​cro·​pi·​no·​cy·​to·​sis ˌmī-krō-ˌpī-nō-ˌsī-ˈtō-səs 

plural micropinocytoses -ˈtō-ˌsēz 

: the incorporation of macromolecules or other chemical substances into cells by membrane invagination and the pinching off of relatively minute vesicles