hay fever

noun Pathology.
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.

Origin:
1820–30

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
hay fever
 
n
allergic rhinitis, Technical names: pollinosis an allergic reaction to pollen, dust, etc, characterized by sneezing, runny nose, and watery eyes due to inflammation of the mucous membranes of the eyes and nose

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

hay fever n.
An allergic condition affecting the mucous membranes of the upper respiratory tract and the eyes, usually characterized by nasal discharge, sneezing, and itchy, watery eyes and usually caused by an abnormal sensitivity to airborne pollen.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
hay fever   (hā)  Pronunciation Key 
An seasonal allergic condition characterized by a sensitivity to airborne pollen, resulting in nasal discharge, sneezing, and itchy, watery eyes. It occurs especially during late spring, late summer, and early fall and can be caused by the pollens of various plants, especially ragweed and certain trees and grasses.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The robots will be shipped nationwide to monitor pollen levels during the
  coming hay fever season.
There is often a family history of allergic conditions such as asthma, hay
  fever, or eczema.
With hay fever, if you have a genetic disposition and you're exposed to pollen,
  you get itchy eyes and a runny nose.
The immune response that causes an allergic reaction is similar to the response
  that causes hay fever.
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