Scylla and Charybdis

Scylla and Charybdis, two rocks opposite each other at a narrow pass of the strait between Italy and Sicily, in the cave of one of which dwelt the former, a fierce monster that barked like a dog, and under the cliff of the other of which dwelt the latter, a monster that sucked up everything that came near it, so that any ship passing between in avoiding the one become a prey to the other.

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

Scutari * Scythians
Scott, William Bell
Scranton
Scribe, Eugene
Scribes, The
Scriblerus, Martinus
Scrivener, Frederick Henry Ambrose
Scroggs, Sir William
Scudéry, Madeleine de
Sculptured Stones
Scutari
Scylla and Charybdis
Scythians
Seabury, Samuel
Sealed Orders
Sea-Serpent
Sebastian. St.
Sebastiano del Piombo
Sebastopol
Sebillot, Paul
Secker, Thomas
Second-Sight