subterranean
adjective(sub-ter-ra-nean)
being, lying, or operating under the surface of the earth
subterranean
adjective(sub-ter-ra-nean)
existing or working in secret : hidden
subterranean
noun(sub-ter-ra-nean)
a large termite (Coptotermes formosanus of the family Rhinotermitidae) native to Taiwan and southern China that forms very large, usually underground colonies and has been introduced into Hawaii and the southern U.S. where it is a destructive pest of wooden structures —called also Formosan subterranean termite