A lapel is the front part of a jacket or suit coat that's folded back. Your jacket's lapel is connected to your collar.

Fancy or dressy men's clothing tends to have lapels — the tuxedo you wear to your uncle's wedding might have a satin lapel, for example. The suits that businessmen (and often women) wear also have lapels. Lapels come in different shapes and widths, although they almost always have a buttonhole on the left side, originally intended for wearing a flower. These days only prom- and wedding-goers tend to stick a flower in their lapel.

Definitions of lapel
  1. noun
    lap at the front of a coat; continuation of the coat collar
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    revere, revers
    a lapel on a woman's garment; turned back to show the reverse side
    type of:
    lap, overlap
    a flap that lies over another part
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