Symplegades (sĭmplĕgˈədēz) [key], 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.
The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.
See more Encyclopedia articles on: Folklore and Mythology