micropinocytic vesicle

micropinocytic vesicle

a flask like invagination of the cell plasma membrane which eventually cuts off at the neck to form a cellular vacuole and contains molecules that are too large to pass through the cell membrane by other means. see PINOCYTOSIS.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005