milker(n = noun.animal) dairy cattle, dairy cow, milch cow, milcher, milk cow - cattle that are reared for their milk; Array
is a kind of bos taurus, cattle, cows, kine, oxen
has particulars: ayrshire, brown swiss, jersey, milking shorthorn, friesian, holstein, holstein-friesian, guernsey

1.  One who milks; also, a mechanical apparatus for milking cows. [1913 Webster]

2.  A cow or other animal that gives milk. [1913 Webster]