/ Dictionary / Index M millidegree: Meaning and Definition of Find definitions for: mil•li•de•gree Pronunciation: (mil'i-di-grē"), [key] — n. one thousandth of a degree. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: millidegree (Thesaurus) millicurie Millie Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language