9 letters · 24 points in Scrabble
noun one million periods per second
originEtymology tree Proto-Indo-European *méǵh₂s Proto-Hellenic *mégas Ancient Greek μέγᾰς (mégăs)der. English mega- English hertz English megahertz From mega- + hertz.
Etymology from Wiktionary, CC BY-SA 3.0