/ Dictionary / Index C custom house: Meaning and Definition of Find definitions for: cus'tom house" Pronunciation: [key] a government building or office, as at a seaport, for collecting customs, clearing vessels, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: customhouse (Thesaurus) customer's man customize Related Content Daily Word Quiz: knead Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language