Wiktionary
abyssus
n. (context obsolete English) (alternate form of abyss English)(R:SOED5: page=11)
Usage examples of "abyssus".
Then, without aplomb, he crossed the Abyssus to the back to the service stairwell and started to climb.
He couldn't help but wonder about the black painted walls of the Lower Eastside club called The Abyssus that she so favored.
He felt as if he stood in the doorway of the Abyssus once more, watching its dead lord lap blood from his little stone altar.