nTincal(Chem) Crude native borax, formerly imported from Thibet. It was once the chief source of boric compounds. Cf. Borax.
Century Dictionary and Cyclopedia
ntincalBorax in its crude or unrefined state: so called in commerce. It is an impure sodium tetraborate or pyroborate, consisting of small crystals of a yellowish color, and is unctuous to the feel. It is employed in refining metals.