allˈergen noun

Any substance that induces an allergic reaction

allergenˈic adjective

Causing an allergic reaction

allergic /ə-lûrˈjik/ adjective

1. (of the body) reacting in an abnormally sensitive manner
2. Suffering from an allergy (to)

An allergic person

allˈergist noun

A doctor specializing in diseases and conditions caused by allergies

allergic rhinitis noun

Hay fever