allergy-n; 1 Senses

Sense Number 1: a condition in which the body's immune system has a hypersensitive reaction to a substance, e.g., pollen, dust, medication

Commentary: ALLERGY[+condition][+physiological][+affliction][+hypersensitivity][+immune_system][+to_substance]

John's allergies are worse when there is lots of pollen in the air.
The patient had no known allergy to sulfa drugs.
She developed an allergy to the loud, overbearing manager. (metaphoric extension, here it means a dislike, antipathy - it's not broad enough usage to warrant a separate meaning, though.)

WordNet 3.0 Sense Numbers: 1