noun
or flu·idrachm |flüə̇(d)|dram, -raa(ə)m
Etymology: fluid (I) + dram or drachm
: either of two units of liquid capacity equal to 1/8 fluid ounce:
a. : a United States unit equivalent to 0.225 cubic inches
b. : a British unit equal to 0.2167 cubic inches — see measure table