Definitions

1. adjective

having an abnormal sensitivity to a particular substance or thing, especially one that is harmless to most people

“She’s allergic to peanuts and can’t have them in the house.”

2. noun

a person who has an abnormal sensitivity to a particular substance or thing

“He’s a severe food allergic and has to carry an EpiPen with him at all times.”

3. verb (transitive)

to make (someone or something) react as if they are sensitive to a particular substance or thing

“The pollen from the trees can allergize people who breathe it in.”

4. verb (intransitive)

to react as if one is sensitive to a particular substance or thing

“The child began to allergize to the new detergent, breaking out in hives after each use.”