11 letters · 15 points in Scrabble
noun any of several lymphokines that promote macrophages and killer T cells and B cells and other components of the immune system
originFrom inter- + leuko- + -in; *inter-: from Latin inter- (“between, amid”), a form of prepositional inter (“between”). *leuko: from Ancient Greek λευκός (leukós, “white”) *-in: from French -ine, from Latin -īna, feminine of -īnus "of" or "belonging to"
Etymology from Wiktionary, CC BY-SA 3.0