macropinocytosis

https://doi.org/10.1351/goldbook.13428
"High-volume" pinocytosis by which dendritic cells engulf relatively large volumes of fluid from their surroundings, enabling them to take in many antigens nonspecifically.
Source:
PAC, 2012, 84, 1113. (IUPAC glossary of terms used in immunotoxicology (IUPAC Recommendations 2012)) on page 1208 [Terms] [Paper]