Illustrated Companion to the Latin Dictionary/Prosumia

This article incorporates text from a publication now in the public domain: Rich, Anthony (1849). The illustrated companion to the Latin dictionary, and Greek lexicon. p. vi. OCLC 894670115. https://archive.org/details/illustratedcompa00rich. 

PROSU'MIA. A small sea-going craft, employed as a spy ship, to keep a look out and watch the motions of an enemy's fleet; but beyond this, its characteristic peculiarities are not ascertained. Festus, s. v. Caecil. ap. Non. s. v. p. 536.