[f. after prec.: see -CRAT.] One who has the mastery of the sea.
1846. Grote, Greece, I. xii. I. 311. An attempt on the part of the great thalassocrat to conquer Sicily. Ibid. (1847), II. xxxiii. IV. 327. The earliest of all Grecian thalassokrats or sea kings.
1905. G. G. A. Murray, in Q. Rev., April, 352. At present England is the thalassocrat.