/ Dictionary / Index A Aarau: Meaning and Definition of Find definitions for: Aar•au Pronunciation: (är'ou), [key] — n. a town in and capital of Aargau, in N Switzerland. 15,927. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Aar aardvark Related Content Daily Word Quiz: rustic Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language