/ Dictionary / Index A amido-: Meaning and Definition of Find definitions for: amido- Pronunciation: [key] a combining form used in the names of chemical compounds in which the −NH group united with an acid radical is present: amidocyanogen. (erroneously) amino-. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. amidinohydrazone amidogen Related Content Daily Word Quiz: nonchalant Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language