Symphlagades

Symphlagades, two fabulous floating rocks at the entrance of the Euxine, which, when driven by the winds, crushed every vessel that attempted to pass between them; the ship Argo (q.v.) managed to pass between them, but with the loss of part of her stern, after which they became fixed.

Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)

Symonds, John Addington * Symphony
Sydenham, Thomas
Sydney
Sydney, Algernon
Syllogism
Sylphs
Sylvester, St.
Sylvester, St.
Symbolism
Syme, James
Symonds, John Addington
Symphlagades
Symphony
Synagogue
Synagogue, the Great
Syncretism
Syndicate
Synergism
Synesius, Bishop Ptolemais
Synod
Synoptic Gospels
Syra