/ Dictionary / Index A adren-: Meaning and Definition of Find definitions for: adren- Pronunciation: [key] var. ofbefore a vowel: adrenergic. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. ad rem adrenal Related Content Daily Word Quiz: lunar Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language