/ Dictionary / Index B bright-field: Meaning and Definition of Find definitions for: bright-field Pronunciation: (brīt'fēld"), [key] — adj. Micros. of or pertaining to the illuminated region about the object of a microscope. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bright-eyed brightline spectrum Related Content Daily Word Quiz: deleterious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language