/ Dictionary / Index E epicycloidal gear: Meaning and Definition of Find definitions for: ep'icycloi'dal gear' Pronunciation: [key] one of the gears of an epicyclic train. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. epicycloid Epidaurus Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language