Literally meaning: “to supply or prepare food”
Origin: Anc Greek
οψωνώ/opsono(=buy meat or food) >όψον/opson(=meat, spice, food, fish)
In 1904 by British bacteriologist and immunologis Almroth Wright coined (1861–1947) who noticed a phagocytosis-promoting effect of serum because of some unknown substances.
An opsonin is any molecule that attaches an antigen enhancing phagocytosis.