/ Dictionary / Index B built-up mast: Meaning and Definition of Find definitions for: built'-up mast' Pronunciation: [key] — Naut. Naut. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. built-up built-up roof Related Content Daily Word Quiz: secular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language