6 letters · 11 points in Scrabble
noun a white fatty substance that forms a medullary sheath around the axis cylinder of some nerve fibers
originEtymology tree Ancient Greek μυελός (muelós)der. English myelo- Proto-Indo-European *-nós Proto-Indo-European *-iHnos Proto-Italic *-īnos Latin -īnusder. Old French -inbor. Middle English -in English -ineclip. English -in English myelin From myelo- + -in. From Ancient Greek μυελός (muelós, “marrow”).
Etymology from Wiktionary, CC BY-SA 3.0