Symplegades

[sim-pleg-uh-deez]

plural noun Classical Mythology.

a pair of rocky islands, at the entrance to the Black Sea, that often clashed together: Athena helped the Argonauts navigate them, after which they became fixed.

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for symplegades

But it interested somewhat as if it had been a part of the Argo, clipped off in passing through the Symplegades.
Cape Cod|Henry D. Thoreau
The story of the Symplegades may be a reference369 to the rolling and clashing of icebergs.
Stories of Old Greece and Rome|Emilie Kip Baker
The first papers passed him by two mountains, which, like the symplegades, threatened to meet and crush him in their embrace.
The Works of Hubert Howe Bancroft, Volume 3|Hubert Howe Bancroft
Euripides, Medea, verse 2, gives them the title of Symplegades.
The Geography of Strabo, Volume I (of 3)|Strabo

After the miraculous passage of the Argo, the Symplegades became permanently united, and attached to the bottom of the sea.
Myths and Legends of Ancient Greece and Rome|E.M. Berens