/ Dictionary / Index M mailbag: Meaning and Definition of Find definitions for: mail•bag Pronunciation: (māl'bag"), [key] — n. a large bag used by mail carriers for carrying mail, usually equipped with a shoulder strap. a large bag or pouch used in transporting mail in bulk from general post offices to branch offices, from city to city, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: mailbag (Thesaurus) mailable mailboat Related Content Daily Word Quiz: panacea Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language