Underground layer Synonyms

Underground replaced

resistant layer

Definitions for Underground

(adjective) undertaken or done so as to escape being observed or known by others
(adjective) being, situated, or operating beneath the surface of the earth
(noun) a secret organization in a conquered country fighting against enemy forces

UL abbreviation

UL is an abbreviation for Underground Layer

What does UL stand for?

UL stands for "Underground Layer"

Layer replaced

underground band

underground vein

underground seam

underground film

underground bed

underground course

Definitions for Layer

(noun) single thickness of usually some homogeneous substance
(noun) a relatively thin sheetlike expanse or region lying over or under another
(noun) thin structure composed of a single thickness of cells