A government vessel for the conveyance of despatches.(noun)
The Century Dictionary (Public Domain)
Use "despatch-boat" in a sentence
"Eteonicus, on his side, as soon as the despatch-boat came sailing in, proceeded to offer sacrifice of thanksgiving in honour of the good news."
"On receipt of the news, however, he sent the despatch-boat out again the way she came, with an injunction to those on board of her to sail off quickly without exchanging a word with any one."
"As to Etenoicus, the details of the engagement ware faithfully reported to him by the express despatch-boat in attendance."