Tom"bac (?), n. [Pg.
tambaca,tambaque, fr. Malay tambāga copper; cf.
Skr. tāmraka; cf. F. tombac.] (Metal.) An
alloy of copper and zinc, resembling brass, and containing about 84 per
cent of copper; -- called also German, or Dutch, brass. It is very
malleable and ductile, and when beaten into thin leaves is sometimes called
Dutch metal. The addition of arsenic makes white
tombac. [Written also tombak, and tambac.]