SG Heritage Dictionary

Subterranean [\N] Webster's Dictionary 1828

1. SUBTERRA'NEAN

2. SUBTERRA'NEOUS, adjective [Latin subter, under, and terra, earth.] Being or lying under the surface of the earth; situated within the earth or under ground; as subterranean springs; a subterraneous passage.

3. [Subterraneal and Subterrany, are not in use.]

Subterranean [Adjective] Webster's Dictionary 1913

Alt. of Subterraneous