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A sea open to all nations. See Mare clausum.

Swimming in the open sea; -- said of certain marine animals.

A genus of nudibranchiate mollusks, found in the warmer latitudes, swimming in the open sea. These mollusks are beautifully colored with blue and silvery white.

ef. (Fine Arts) See Alto-rilievo. -- High school. See under School. High seas (Law), the open sea; the part of the ocean not in the territorial waters of any particular sovereignty, usually distant three miles or more from the coast line. Wharton. -- High steam, steam having a high pressure. -- High steward, the chi…

sea; hence, a body of water within the separate jurisdiction of the nation; -- opposed to open sea, the water open to all nations and over which no single nation has special control.

Free or cleared of obstruction to progress or to view; accessible; as, an open tract; the open sea.

Robbery on the high seas; the taking of property from others on the open sea by open violence; without lawful authority, and with intent to steal; -- a crime answering to robbery on land.

The open sea supposed to surround the north pole. Kane.

ll bring a sword upon you that shall avenge the quarrel of my covenant. Lev. xxvi. 25. On open seas their quarrels they debate. Dryden.

aut.), to keep safe afloat during (a storm) while riding at anchor or when hove to on the open sea; as, to ride out the gale. to ride the lightning, (Colloq.) to be executed by electrocution in an electric chair.

Any one of the large bivalve mollusks found on the open seacoast, especially those of the family Mactridæ, as the common American species. (Mactra, or Spisula, solidissima); -- called also beach clam, and surf clam.

A boat or vessel adapted to the open sea; hence, a vessel considered with reference to her power of resisting a storm, or maintaining herself in a heavy sea; as, a good sea boat.

very delicate, transparent and iridescent ctenophore (Cestum Veneris) which swims in the open sea. Its form is due to the enormous development of two spheromeres. See Illust. in Appendix. -- Venus's hair (Bot.), a delicate and graceful fern (Adiantum Capillus-Veneris) having a slender, black and shining stem and bran…