/ Dictionary / Index S spiral bevel gear: Meaning and Definition of Find definitions for: spi'ral bev'el gear" Pronunciation: [key] — Mach. Mach. a bevel gear having curved teeth tending to converge on the axis of rotation. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. spiral arm spiral binding Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language