Illustrated Companion to the Latin Dictionary/Mystrum

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. 

MYS'TRUM (μύστρον). A liquid measure of the Greeks, containing the fourth part of a cyathus. Rhemn. Fan. 77.