Breadcrumb Home > Dictionary > Index B brightline spectrum: Meaning and Definition of Find definitions for: bright'line spec'trum Pronunciation: (brīt'līn"), [key] — Physical Chem. Physical Chem. the spectrum of an incandescent substance appearing on a spectrogram as one or more bright lines against a dark background. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. bright-field brightness TrendingHere are the facts and trivia that people are buzzing about. Chinese New Year History, Meaning, and Celebrations Current Events This Week: February 2024 Valentine's Day Valentine's Day History Mardi Gras 30 "Charlie and the Chocolate Factory" Quotes ✖ Related Content Daily Word Quiz: irascible Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language