/ Dictionary / Index R rustout: Meaning and Definition of Find definitions for: rust•out Pronunciation: (rust'out"), [key] — n. rust-through. an area or spot, as on the body of a car, that has rusted through: scratches, dents, and rustouts. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Ruston rustproof Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language