/ Dictionary / Index B blue-green: Meaning and Definition of Find definitions for: blue-green Pronunciation: (bl'grēn'), [key] — n. a color about midway between blue and green in the spectrum. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: blue-green (Thesaurus) Bluegrass State blue-green algae 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