Symplegades(redirected from Cyaneae insulae)
Symplegades(sĭmplĕg`ədēz), in Greek mythology, two floating cliffs that swung together and crushed anything going between them until Jason's ship, the Argo, passed safely through them. They remained still forever after, forming the entrance to the Black Sea.
“Clashing Cliffs” at the entrance to the Black Sea, said to crush vessels. [Classical Myth.: New Century, 1043]
cliffs at Black Sea entrance; clashed together as ships passed through. [Gk. Myth.: Zimmerman, 251]