SUBTERRAIN

Etymology

Noun

subterrain (countable and uncountable, plural subterrains)

(geology) The bedrock or rock layer that lies beneath the soil and superficial features of an area.

A cave or underground room.

An underground region.

An underlying basis or undercurrent.

Adjective

subterrain (comparative more subterrain, superlative most subterrain)

synonym of subterranean

Anagrams

• rurbanites

Source: Wiktionary