The Collaborative International Dictionary of English v.0.48:

Cytherean \Cyth`er*e"an\ (s?th`?r--?"an), a. [L. Cythereus, from
   Cythera, Gr. ???, now Cerigo, an island in the [AE]gean Sea,
   celebrated for the worship of Venus.]
   Pertaining to the goddess Venus.
   [1913 Webster]