9 letters · 22 points in Scrabble
originEtymology tree Proto-Indo-European *gʷeyh₃-der. Ancient Greek βῐ́ος (bĭ́os) Ancient Greek βῐο- (bĭo-)der. English bio- Proto-Indo-European *ser-? Proto-Indo-European *srew- Proto-Indo-European *sru-dʰ-mo-s Proto-Hellenic *hrutʰmós Ancient Greek ῥῠθμός (rhŭthmós)bor. Latin rhythmusder. English rhythm English biorhythm First coined 1960, from bio- + rhythm.
Etymology from Wiktionary, CC BY-SA 3.0