/ Dictionary / Index E extranuclear: Meaning and Definition of Find definitions for: ex•tra•nu•cle•ar Pronunciation: (ek"stru-n'klē-ur, -ny'- or, by metathesis, -kyu-lur). [key] — adj. Cell Biol. pertaining to or affecting the parts of a cell outside the nucleus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. extraneous extraocular muscle Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language