Illustrated Companion to the Latin Dictionary/Trigarius

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. 

TRIGA'RIUS. One who drives a team of three horses yoked to a car (triga). Plin. H. N. xxviii. 42.