\Tom"bac\, n. [Pg. tambaca,tambaque, fr. Malay tamb[=a]ga
copper; cf. Skr. t[=a]mraka; 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}.]