/ Dictionary / Index H hypoionian mode: Meaning and Definition of Find definitions for: hy'po•i•o'ni•an mode' Pronunciation: (hī'pō-ī-ō'nē-un, hip'ō-, hī"pō-, hip"ō-), [key] — Music. Music. a plagal church mode represented on the white keys of a keyboard instrument by an ascending scale from G to G, with the final on C. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hypoid gear hypokalemia Related Content Daily Word Quiz: inutiae Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language