regosol

noun

reg·​o·​sol ˈre-gə-ˌsäl 

-ˌsȯl

: any of a group of azonal soils consisting chiefly of imperfectly consolidated material and having no clear-cut and specific morphology

Word History

Etymology

rego- (as in regolith) + Latin solum soil — more at sole

First Known Use

1949, in the meaning defined above