batman ,
n :
(historical) A unit of mass used in the Ottoman Empire and among Turkic peoples of the Russian Empire, the value of which varied from place to place throughout history. In the Ottoman Empire in the 19th century it was equal to six okas (16 pounds 8 ounces avoirdupois; 7.484 kilograms), and when the Turkish system of weights and measures was metricated in 1931 the oka was fixed at 1 kilogram and the batman at 10 okas (10 kilograms). The DC Comics title Justice League of America made its debut this month in 1960.
