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I think I would have speedy deleted this, but it has about 10 linked pages. I always saw cows' milk FWIW. Mglovesfun (talk) 23:11, 5 February 2010 (UTC)
Move to RfV. Seems purely empirical. DCDuringTALK 00:18, 6 February 2010 (UTC)
Right or wrong, but there seems to be plenty of usage, at least judging by a Google search. A common misspelling? --Hekaheka 05:11, 6 February 2010 (UTC)
No, it's sum of parts. Milk from a cow. How sum of parts can you get? Mglovesfun (talk) 14:27, 6 February 2010 (UTC)
If there is some kind of question, such as you raised, about whether it is "cowmilk", "cow-milk", "cow milk", "cow's milk", or "cows' milk", perhaps users need our help in selecting the right word both in speech and in writing. You don't want them to make mistakes, do you? As we have dispensed with CFI and increasingly rely on intuition, voting, and the principle of helping users select forms of expression, we would seem to need this. DCDuringTALK 15:21, 6 February 2010 (UTC)
Of course, you can also buy cat milk - which isn't milk from cats, but non-cow milk for cats. SemperBlotto 15:24, 6 February 2010 (UTC)