Strong’s Hebrew
H5427 — nether
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
נֶתֶר
nether — pronounced neh'-ther
from 5425; mineral potash (so called from effervescing with acid):--nitre. see H05425
2 occurrences in the KJV.
Proverbs 25:20
As he that taketh away a garment in cold weather, and as vinegar upon nitre, so is he that singeth songs to an heavy heart.
Jeremiah 2:22
For though thou wash thee with nitre, and take thee much soap, yet thine iniquity is marked before me, saith the Lord GOD.