Also found in: Dictionary, Thesaurus, Encyclopedia.
Related to opsonic: opsonic index
Relating to opsonins or to their use.
Of, relating to, or produced by opsonins.
Relating to opsonins or to their utilization.
opsonin(ŏp-sō′nĭn) [Gr. opsonein, to purchase food]
A substance that coats foreign antigens, making them more susceptible to macrophages and other leukocytes, thus increasing phagocytosis of the organism. Complement and antibodies are the two main opsonins in human blood. opsonic (-sŏn′ĭk), adjective
Opsonin formed after stimulation by a specific antigen.