mailship means A ship used to carry mail. Lexicurio rates it Sui generis — a strength score of 100 out of 100.
Etymology
From mail + ship.
noun
- A ship used to carry mail.“The newest ships using the Admiralty Pier are the Belgian mailships, the Roi Leopold III, the Koningin Elisabeth and the Reine Astrid, all of 3,794 tons, and built in 1956, 1957 and 1958 respectively.”