Pronunciation: (sil'u),[key] —n. 1. Modern, Scilla. a rock in the Strait of Messina off the S coast of Italy.
2. Class. Myth.a sea nymph who was transformed into a sea monster: later identified with the rock Scylla. Cf. Charybdis (def. 2).
3. between Scylla and Charybdis, between two equally perilous alternatives, neither of which can be passed without encountering and probably falling victim to the other.