UNDEREARTH

I. ˈ ̷ ̷ ̷ ̷ˌ ̷ ̷ adjective

Etymology: under (II) + earth, n.

: subterranean

II. noun

Etymology: under (III) + earth

1. : the soil beneath the earth's surface : an underlying layer (as of clay)

2. : the depths of the earth