\Tin"cal\, n. [Ar., Per. & Hind. tink[=a]r; cf. Malay
tingkal; all fr. Skr. ?a?ka?a. Cf. {Altincar}.] (Chem.)
Crude native borax, formerly imported from Thibet. It was
once the chief source of boric compounds. Cf. {Borax}.