Douglas Harper's Etymology Dictionary
Wiktionary
skim-milk
a. (attributive of skim milk lang=en nodot=1), ''noun''.
Usage examples of "skim-milk".
More skim-milk coloured, but known by lanceolate leaves - cuckoo bushes.
They will slink away from the Government Communal Games to play solitaire in catacombs over a bowl of unsterilised skim-milk.