The Collaborative International Dictionary of English v.0.48:
Skim \Skim\, a. Contraction of Skimming and Skimmed. [1913 Webster] Skim coat, the final or finishing coat of plaster. Skim colter, a colter for paring off the surface of land. Skim milk, skimmed milk; milk from which the cream has been taken. [1913 Webster]