noun
Benadryl
BEH-nuhd-rihl
noun
1
A brand-name antihistamine used to relieve allergy symptoms or as a sedative.
"She took Benadryl to calm her hay fever."
How to Use Benadryl
Learner’s notesIn plain EnglishA well-known over-the-counter allergy medicine, often also used to help people sleep because it causes drowsiness.
Word Forms
Benadryls plural
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She took _____ to calm her hay fever.
Etymology
A trademarked name built from "benzhydryl," referring to the drug’s chemical structure.