/ Dictionary / Index B built-up: Meaning and Definition of Find definitions for: built-up Pronunciation: (bilt'up"), [key] — adj. built by the fastening together of several parts or enlarged by the addition of layers: This shoe has a built-up heel. (of an area) filled in with houses, as an urban region. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: built-up (Thesaurus) built-in obsolescence built-up mast 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