an acute inflammation of the eyes and upper respiratory tract, accompanied by sneezing: it is an allergic reaction, caused mainly by the pollen of some grasses and trees; pollinosis
See hay fever in American Heritage Dictionary 4
noun
An allergic condition affecting the mucous membranes of the upper respiratory tract and the eyes, most often characterized by nasal discharge, sneezing, and itchy, watery eyes and usually caused by an abnormal sensitivity to airborne pollen. Also called pollinosis.