/ Dictionary / Index B boil-off: Meaning and Definition of Find definitions for: boil-off Pronunciation: (boil'ôf", -of"), [key] — n. any vapor loss from the oxidizer or fuel in a rocket during countdown. Also called the process of degumming silk. the process of removing sizing, wax, impurities, etc., from fabric by scouring. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. boiling point boil-over Related Content Daily Word Quiz: blanch Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language