10 letters · 18 points in Scrabble
noun a hemoprotein composed of globin and heme that gives red blood cells their characteristic color; function primarily to transport oxygen from the lungs to the body tissues
originOriginally hematinoglobulin, from hematin (from Ancient Greek αἷμα (haîma, “blood”) + -in) + -o- + globulin (from Latin globus (“ball, sphere”) + -in).
Etymology from Wiktionary, CC BY-SA 3.0