/ Dictionary / Index M metaphase: Meaning and Definition of Find definitions for: met•a•phase Pronunciation: (met'u-fāz"), [key] — n. Cell Biol. the stage in mitosis or meiosis in which the duplicated chromosomes line up along the equatorial plate of the spindle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: metaphase (Thesaurus) metaph. metaphase plate Related Content Daily Word Quiz: mamba Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language