boutonnière
noun/ˌbuːtɒnˈjeə(r)/
/ˌbuːtnˈɪr/, /ˌbuːtnˈjer/
(North American English, from French) (British English buttonhole)
- a flower that is worn in the buttonhole of a coat or jacket
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boutonnière
Definition of boutonnière noun from the Oxford Advanced Learner's Dictionary