Definition of apothecaries' measure in US English:

apothecaries' measure

(also apothecaries' weight)

noun

historical
  • Systems of units formerly used in pharmacy for liquid volume (or weight). They were based respectively on the fluid ounce (= 8 drachms or 480 minims) and the ounce troy (= 8 drams or 24 scruples or 480 grains).

Pronunciation

apothecaries' measure

/əˈpäTHəkerēz ˌmeZHər/