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A boutonniere is a flower, or a tiny spray of flowers, that a man wears to the left lapel of his jacket, usually at a wedding — through the buttonhole. The word is French. In American English this spelling is the usual one for the flower; in British English people often just call that flower a buttonhole, the same word as the hole itself. Though actually, the woman’s matching flower is not a boutonniere: that is a corsage, worn on the wrist or pinned to her dress. In a Taiwan wedding almost everyone will say 胸花 for the man’s lapel flower, the groomsmen’s flowers, and sometimes the guests’ flowers too.
胸花（特指男士別在西裝領上的那朵；台灣婚禮一律叫胸花）
組成Borrowed from French boutonnière, from bouton (button) + -ière. In French it first means the buttonhole; the flower sits in that hole.
同家族的字
- buttonFrench bouton is the same idea; the flower sits by the buttonhole
- buttonholeBritish English often uses this word for the flower as well as for the hole
原始詞典資料1 筆記錄
以下是外部詞典記錄的用法，原文照列，我們還沒有寫成教學內容。上面的說明才是我們自己寫的；有些用法可能上面已經講過了。
boutonnierenoun/ˌbuːtənˈiːɚ/
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A small flower or bunch of flowers worn in a buttonhole or pinned to the lapel of a jacket.
- The rare white "Heliotrope" whose flower can can be worn as a boutanniere ^([sic]) and whose scent can be discreetly sprinkled on hankerchieves.
資料來源：英文維基詞典 English Wiktionary（CC BY-SA 4.0）。 原文照列，未經改寫。