1. a small flower or decorative arrangement worn on the lapel of a coat or jacket, especially by men at formal events

Examples

• The groom wore a white rose boutonniere on his tuxedo lapel.
• Each groomsman received a matching boutonniere before the wedding ceremony.
• She pinned the boutonniere carefully to avoid damaging his suit jacket.
• The florist created elegant boutonnieres using baby’s breath and small orchids.
• His boutonniere complemented the bride’s bouquet perfectly.
• The prom committee provided boutonnieres for all the male students.
• He felt underdressed without a boutonniere at the formal dinner.