paquebot

Etymology
Borrowed from. First used in Great Britain in 1894, the term was adopted for general use by the Universal Postal Union in 1897.

Noun

 * 1) a mailboat
 * 2)  a postal marking or cancellation stamped on mail posted at sea or in a harbour for processing by the postal authorities at the next port of call. Mail so marked in one country will often carry the stamps of another country.

Adjective

 * 1) Relating to mail posted at sea.
 * a paquebot letter
 * a paquebot duplex

Usage notes
The word would typically be stamped in upper case, PAQUEBOT, on the postal item, but when described in text would be written with a capital P only, eg, Paquebot.

Etymology
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Noun

 * 1) ship, liner