Illustrated Companion to the Latin Dictionary/Arenarius

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. 

ARENA'RIUS. A general term for any one who contended in the arena of an amphitheatre either against his fellow-men, or with wild beasts, including therefore the GLADIATORES and BESTIARIUS. Pet. Sat. cxxvi. 6.

2. A teacher of arithmetic or geometry, so called because he marked out his calculations or diagrams upon a tray covered with sand. Tertull. Pall. 6. ABACUS, 1.