moi·dore (moi'dôr', -dōr', moi-dôr', -dōr') n. A former Portuguese or Brazilian gold coin that was also current in England in the early 18th century.
[Alteration of Portuguese moeda d'ouro : moeda (from Latin monēta, coin; see money) + de, of (from Latin dē; see de-) + ouro, gold (from Latin aurum).]