/ Dictionary / Index S sun-and-planet gear: Meaning and Definition of Find definitions for: sun'-and-plan'et gear" Pronunciation: (sun'un-plan'it), [key] — Mach. Mach. a planetary epicyclic gear train. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Sun Also Rises, The* sun animalcule Related Content Daily Word Quiz: procrastinate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language