/ Dictionary / Index A ach*: Meaning and Definition of Find definitions for: ach Pronunciation: (äkh), [key] — interj. German. alas; oh. ACH Pronunciation: [key] automated clearinghouse. ACh Pronunciation: [key] — Biochem. Biochem. acetylcholine. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. acey-deucy Achab Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language