Illustrated Companion to the Latin Dictionary/Biprorus

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. 

BIPRO'RUS (δίπρωρος). Having a double prow (Hygin. Fab. 168. 277.); which probably means a vessel built sharp fore and aft, like the fast-sailing "proas" of the Indian seas, so that it could sail either way without tacking or going about. Compare Tac. Ann. ii. 6.