mystrum [Greek, μύστρον]

Two units of liquid capacity in later Greek. chart symbol 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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