Source : Webster's Revised Unabridged Dictionary (1913)

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.