Pronunciation: (sē'kwin),[key] —n. 1. a small shining disk or spangle used for ornamentation, as on women's clothing and accessories or on theatrical costumes.
2. a former gold coin of Venice, introduced in 1284; ducat.
3. a former gold coin of Malta, introduced c1535.
4. a former gold coin of Turkey, introduced in 1478. Also,zecchino,zechin(for defs. 2–4).