Messina, Strait of Syllabification: (Mes·si·na, Strait of)Definition of Messina, Strait of a channel that separates the island of Sicily from the “toe” of Italy. It forms a link between the Tyrrhenian and Ionian seas. The strait, which is 20 miles (32 km) long, is noted for the strength of its currents. Messina, Strait of in other Oxford dictionaries Definition of Messina, Strait of in the British & World English dictionary