The Collaborative International Dictionary of English v.0.48:
Keg \Keg\ (k[e^]g), n. [Earlier cag, Icel. kaggi; akin to Sw. kagge.] A small cask or barrel. [1913 Webster]WordNet (r) 3.0 (2006):
keg n 1: the quantity contained in a keg [syn: keg, kegful] 2: small cask or barrel