fluid dram

noun

1. the eighth part of a fluid ounce. Abbreviation: fl dr; Symbol: f

noun

1. another name for drachm

n.

1. A unit of volume or capacity in the apothecary system, equal to 18 of a fluid ounce or 3.70 milliliters.

1. A unit of liquid volume or capacity in the US Customary System equal to 18 of a fluid ounce (3.70 milliliters).