7 letters · 10 points in Scrabble
noun a measure of explosive power (of an atomic weapon) equal to that of one million tons of TNT
noun one million tons
originEtymology tree Proto-Indo-European *méǵh₂s Proto-Hellenic *mégas Ancient Greek μέγᾰς (mégăs)der. English mega- English ton English megaton From mega- + ton.
Etymology from Wiktionary, CC BY-SA 3.0