/ Dictionary / Index C cycloidal propulsion: Meaning and Definition of Find definitions for: cycloi'dal propul'sion Pronunciation: [key] — Naut. Naut. propulsion of a vessel by propellers of controllable pitch that steer as well as propel. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. cycloid cyclolysis Related Content Daily Word Quiz: philately Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language