leukocyte physiology trait phagocytosis trait VT:0010667 Any measurable or observable characteristic related to the endocytosis process that results in the engulfment of external particulate material by phagocytes. The particles are initially contained within phagocytic vacuoles (phagosomes), which then fuse with primary lysosomes to effect digestion of the particles. GO:0006909 Trait.ontology caripark 2014-07-25T02:52:20Z