Strong's #1287: boriyth (pronounced bo-reeth')

feminine of 1253; vegetable alkali:--sope.

Brown-Driver-Briggs Hebrew Lexicon:

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bôrı̂yth

1) lye, potash, soap, alkali (used in washing)

Part of Speech: noun feminine

Relation: from H1253

Usage:

This word is used 2 times:

 

Jeremiah 2:22: "thou wash thee with niter, and take thee much soap, yet thine iniquity is marked before me, saith"
Malachi 3:2: "is like a refiner's fire, and like fullers' soap:"