/ Dictionary / Index M monocline: Meaning and Definition of Find definitions for: mon•o•cline Pronunciation: (mon'u-klīn"), [key] — n. Geol. a monoclinal structure or fold. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: monocline (Thesaurus) monoclinal monoclinic Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language