/ Dictionary / Index A air mattress: Meaning and Definition of Find definitions for: air' mat"tress Pronunciation: [key] a mattress, usually of plastic or rubber, that can be inflated for use, as in camping, and deflated for storage. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. air mass Air Medal Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language