borax

bo·rax

noun \ˈbō(ə)r-ˌaks, ˈbȯ(ə)r-, -əks\

Definition of BORAX

: a white crystalline compound that consists of a hydrated sodium borate Na₂B₄O₇·10H₂O, that occurs as a mineral or is prepared from other minerals, and that is used especially as a flux, cleansing agent, and water softener and as a preservative