/ Dictionary / Index H hay fever: Meaning and Definition of Find definitions for: hay' fe"ver Pronunciation: [key] — Pathol. Pathol. a type of allergic rhinitis affecting the mucous membranes of the eyes and respiratory tract, affecting susceptible persons usually during the summer, caused by pollen of ragweed and certain other plants. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Hayes hayfield Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language