the GNU version of the Collaborative International Dictionary of English
n. A cave or room under ground.
The Century Dictionary and Cyclopedia
Underground; subterranean.
n. A cave or room under ground.
n. In geology, a terrane beneath an overlying terrane.
Word Usage
"I watched men in moon suits bury drums of nuclear waste and I thought of the living rocks down there, the subterrane process, the half-life, the atoms that decay to half the original number."