/ Dictionary / Index L luteal phase: Meaning and Definition of Find definitions for: lu'teal phase" Pronunciation: [key] — Physiol. Physiol. a stage of the menstrual cycle, lasting about two weeks, from ovulation to the beginning of the next menstrual flow. Cf. follicular phase. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. luteal lutecium Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language