Definition of "subterrestrial" []

• Subterranean; underground. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Richard Shaver, for instance, stated that subterrestrial beings he "knew" about were in possession of advanced technology that created seemingly solid (holographic) images, such as space ships (UFOs), along with other more sinister mind-altering machines."
• "Settlers of every nation are embedded in the STZs subterrestrial zones."
• "Those two extremities of stile Mr Dryden illustrates by the familiar image of two inns, which I shall term the aerial and the subterrestrial."