11 letters · 27 points in Scrabble
noun a line generated by a point on a circle that rolls around inside another circle
originEtymology tree Proto-Indo-European *upó Ancient Greek ῠ̔πό (hŭpó) Ancient Greek ὑπο- (hupo-)der. English hypo- English cycloid English hypocycloid From hypo- (“below or inside”) + cycloid.
Etymology from Wiktionary, CC BY-SA 3.0