Breadcrumb Home > Dictionary > Index D Cite demeclocycline: Meaning and Definition of Find definitions for: dem•e•clo•cy•cline Pronunciation: (dem"u-klō-sī'klēn), [key] — n. Pharm. a broad-spectrum antibiotic, CHClNO, derived from a mutant strain of the bacterium Streptomyces aureofaciens: used against a wide range of susceptible microorganisms. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. demeanor dement TrendingHere are the facts and trivia that people are buzzing about. January 2021 Current Events: US News Noble Titles and Ranks in a Monarchy Chinese New Year History, Meaning, and Celebrations The Manchu The 5 Best Air Purifiers of 2020 Inaugural Trivia Related Content Daily Word Quiz: umbrage Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language