Obs. rare–1. [f. Gr. θαλάσσι-ος marine, maritime + -αρχος ruling, ruler.] Hence † Thalassiarchy Obs. rare–0. (See quots.)
1656. Blount, Glossogr., Thalassiarck, an Admiral or chief Officer at sea.
1727. Bailey, vol. II., Thalassiarchy, the Admiralship, or the office of the Admiral.
1858. J. Watts de Peyster, Hist. Carausius, 32. The new Præfect and Thalassiarch assembled and employed the ablest constructors and shipwrights in the ports of Gaul.
