13 letters · 22 points in Scrabble
noun an analgesic for mild pain but not for inflammation; also used as an antipyretic; (Datril, Tylenol, Panadol, Phenaphen, Tempra, and Anacin III are trademarks of brands of acetaminophen tablets)
originShortening of the chemical name para-acetylaminophenol. By surface analysis, acet- + amino- + -phen.
Etymology from Wiktionary, CC BY-SA 3.0