/ Dictionary / Index H horsehair fungus: Meaning and Definition of Find definitions for: horse'hair fun"gus Pronunciation: [key] an edible white, striated, umbrella-capped mushroom, Marasmius rotula, commonly found in eastern North America. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. horsehair-blight fungus horsehair worm Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language