n. crude native borax, formerly imported from Tibet, and once the chief source of boric compounds
the GNU version of the Collaborative International Dictionary of English
n. Crude native borax, formerly imported from Thibet. It was once the chief source of boric compounds. Cf. borax.
The Century Dictionary and Cyclopedia
n. Borax in its crude or unrefined state: so called in commerce.
Word Usage
"The principal boron minerals are borax or "tincal" (hydrated sodium borate), colemanite (hydrated calcium borate), ulexite (hydrated calcium-sodium borate), and boracite (magnesium chloro-borate)."