/ Dictionary / Index D Douglas bag: Meaning and Definition of Find definitions for: Doug'las bag" Pronunciation: [key] an airtight bag used to collect expired air for analysis of oxygen consumption. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Douglas Douglas fir Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language