The Britannica Dictionary
mobile search
Home
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
×
Britannica Homepage
Ask the Editor
Word of the Day
Quizzes
Core Vocabulary
Browse the Dictionary
The Britannica Dictionary
hay fever
1 ENTRIES FOUND:
hay fever
(noun)
hay fever
noun
hay fever
noun
Britannica Dictionary definition of HAY FEVER
[
singular
]
medical
:
a sickness that is like a cold and that is caused by breathing in plant pollen
ASK THE EDITOR
What is the difference between 'too' and 'to'?
See the answer »
QUIZZES
Vocabulary Quiz
Test your word power
Take the Quiz »
Name That Thing
Take our visual quiz
Test Your Knowledge »
WORD OF THE DAY
institution
:
an established organization
Learn More »