Illustrated Companion to the Latin Dictionary/Turma

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. 

TURMA (ἴλη). A troop or company of cavalry, originally consisting of thirty men and three officers (decuriones). Varro, L. L. v. 91.