/ Dictionary / Index H hydromedusa: Meaning and Definition of Find definitions for: hy•dro•me•du•sa Pronunciation: (hī"drō-mi-d'su, -zu, -dy'-), [key] — pl. -sae the medusa form of a hydrozoan. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. hydromechanics hydromel Related Content Daily Word Quiz: dispel Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language