/ Dictionary / Index R rust-through: Meaning and Definition of Find definitions for: rust-through Pronunciation: (rust'thr"), [key] — n. an act or instance of rusting: The body of the car is protected against rust-through. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. rustproofing rusty Related Content Daily Word Quiz: vernacular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language