the GNU version of the Collaborative International Dictionary of English
adj. Subterraneous.
The Century Dictionary and Cyclopedia
Subterranean.
Word Usage
"But don't be surprised, you who will be guarding them at their subterrene caviar and quails-in-aspic, if they have you eating each other, the better to control you and keep you on your toes and the edge on your murderous 'competitive spirit'."