/ Dictionary / Index H hypostome: Meaning and Definition of Find definitions for: hy•po•stome Pronunciation: (hī'pu-stōm"), [key] — n. Zool. any of several parts or organs of the mouth, as the labrum of a crustacean. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hyposthenia hypostyle Related Content Daily Word Quiz: vernacular Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language