Merriam-Webster's Collegiate® Dictionary, 11th Edition
RUM
I. noun
Etymology: probably short for obsolete rumbullion rum
Date: 1654
an alcoholic beverage distilled from a fermented cane product (as molasses), alcoholic liquor ,
II. adjective (rummer; rummest)
Etymology: origin unknown
Date: 1752
queer , odd , difficult , dangerous