Breadcrumb Home > Dictionary > Index A aer-: Meaning and Definition of Find definitions for: aer- Pronunciation: [key] var. ofbefore a vowel: aerate. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. aequorin aerarian ✖ Related Content Daily Word Quiz: musth Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language