subsalt

sub- +‎ salt

subsalt (not comparable)

1. Lying beneath a layer of salt.
   • 2008 January 11, Alexei Barrionuevo, “Hot Prospect for Oil’s Big League”, in New York Times‎:

     The subsalt basin that contains Tupi, the new deepwater field estimated to hold the equivalent of five billion to eight billion barrels of light crude oil, is creating a buzz among the world’s largest oil companies.

subsalt (plural subsalts)

1. (chemistry, archaic) A basic salt.

• supersalt