This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A sea route.

n. An inland waterway for ocean shipping.

n. The headway of a ship.

n. A rough sea.

n. a lane or route at sea that is regularly used by ships; a sea lane or trade route

n. an inland waterway used by seagoing shipping

n. the headway of a vessel

n. Nautical, progress made by a vessel through the waves.

n. a lane at sea that is a regularly used route for vessels

""Not an international strait, but a shipping route, something like the St. Lawrence seaway, which is carefully managed with sufficient infrastructure to ensure that ships can pass safely through to everyone's economic interest and at the same time have security threats dealt with and deterred.""

lane   

in a seaway   

St. Lawrence Seaway    Saint Lawrence Seaway   

freeway    leeway   

rowlock    kickewr    jeroboam    posttraumatic    wine-merchant