o 1 p 3 s 1 o 1 n 1 i 1 n 1
7 letters · 9 points in Scrabble
Meaning
noun an antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes
originFrom Ancient Greek ὀψωνέω (opsōnéō, “to purchase provisions, to buy victuals, to cater”) + -in.
Etymology from Wiktionary, CC BY-SA 3.0