15 letters · 18 points in Scrabble
adjective (of long-chain carbon compounds especially fats) saturated except for one multiple bond
originEtymology tree Ancient Greek μόνος (mónos) Ancient Greek μονο- (mono-)der. English mono- English unsaturated English monounsaturated From mono- + unsaturated.
Etymology from Wiktionary, CC BY-SA 3.0