The minim is a unit of volume in both the imperial and U.S. customary systems of measurement. Specifically, in the imperial system, it is 1⁄60 of an imperial fluid drachm or 1⁄480 of an imperial fluid ounce; in the U.S. customary system, it is 1⁄60 of a US customary fluid dram or 1⁄480 of a US customary fluid ounce.