Illustrated Companion to the Latin Dictionary/Tonsa

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. 

TONSA. An oar; a term employed by the poets, and mostly in the plural number. Ennius ap. Fest. s. v. Virg. Lucan. Sil. Ital.