It contained the weight in water of fifteen Attic drachmae.
Used with some frequency by Pliny the Elder, in a 1952 translation the unit was judged to be equivalent to 63 ml (2.2 imp fl oz; 2.1 US fl oz).
[1] However, other sources estimate a higher value of perhaps 68 ml (2.4 imp fl oz; 2.3 US fl oz) (see Ancient Roman units of measurement).
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