The only unit of measure that is shared between the apothecary system and avoirdupois system is the

The apothecary system is a historical system of mass and volume units that were used by physicians and apothecaries for medical recipes.The avoirdupois system is a measurement system of weights which uses pounds and ounces as units.
The grain is the only unit of measure that is shared between the apothecary system and avoirdupois system.

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