Two units of liquid capacity in later Greek. 
The historical record consists of a variety of conflicting descriptions, at
times in the same author:
| small mystrum | large mystrum | ratio | |
|---|---|---|---|
| Galen, c. 15 | 1/24 cotyle | ¼ cyathus, about 11 milliliters | 1:1 |
| Galen, c. 13 | 1 1/3 oxybaph | 3 oxybaph | 2.25:1 |
| Cleopatra | 1/22 cotyle | 1/16 cotyle | 1.38:1 |
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Last revised: 19 May 2006.