Illustrated Companion to the Latin Dictionary/Cetra

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. 

CETRA. A small round shield (Varro, ap. Non. s. v. p. 555. and p. 82.), covered with hide (Serv. ad Virg. Aen. vii. 732.); chiefly employed by the natives of Africa, Spain, and ancient Britain (Tac. Agr. 36.), the form and character of which is believed to be preserved in the target of the Scottish highlanders.