Illustrated Companion to the Latin Dictionary/Ergastulus
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.
ERGAS'TULUS. A slave condemned to the ergastulum. Lucil. Sat. xv. 8. ed. Gerlach.