Illustrated Companion to the Latin Dictionary/Obolus

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. 

OB'OLUS (ὀβολός). A small piece of Greek money, originally of silver coinage, but in later times of bronze; and of which there were two standards  — the Attic, worth about 1½d. of our money, and the Aeginetan, worth about 2¼d. Vitruv. iii. 1. 7.