thalasso-, thalass-, thalassi-, thalassio-, thalatto-, thalatt- +

(Greek: sea, ocean)

Traditionally, there are five oceans: the Atlantic, the Pacific, the Indian, the Arctic, and the Antarctic. The Antarctic Ocean, lacking any precise natural boundaries, is sometimes considered an extension of the Atlantic, the Pacific, and the Indian oceans.

The adjacent bodies of salt water and various subdivisions of the oceans are generally known as seas, but local usage may also sanction such terms as gulfs, bays, channels, and straits; designations that are sometimes used interchangeably.

thalassotherapy
1. The treatment of an illness with sea bathing, sea-water bathing, sea voyages, etc.
2. Treatment of disease by sea air, sea baths, or even an ocean cruise, etc.
thalattology
That branch of science which studies the sea.

Inter-related cross references, directly or indirectly, involving the "sea" and the "ocean" bodies of water: abysso- (bottomless); Atlantic; batho-, bathy- (depth); bentho- (deep, depth); halio-, halo- (salt or "the sea"); mare, mari- (sea); necto-, nekto- (swimming); oceano-; pelago- (sea, ocean); plankto- (drifting).