In Great Britain, a unit of mass, = 1/96th of a Troy or apothecaries' pound, approximately 3.88793 grams. The Weights and Measures Act of 1975 prohibited its use in trade.
In the United Kingdom, the fluid drachm (sometimes, fluidrachm), a unit of liquid capacity in the apothecaries' measure system, approximately 3.55163 milliliters. Symbol, .
The fluid drachm was scheduled for abolition by the 1963 Weights and Measures Act, and became no longer legal in trade on February 1, 1971, the date being set in the 1970 Weights and Measures Act.
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Last revised: 16 August 2001.