1.NounAny breed of cow bred for the ability to produce large quantities of milk, from which dairy products are made; an individual cattle beast of such a breed; especially, a female cow who has calved and lactated.
"; The Holstein Friesian is an excellent dairy cow. [breed]; He runs a herd of dairy cows, including his own bulls. [cattle beast]; Mastitis impairs a dairy cow’s output. [lactating female]"
2.NounA black-and-white varietal of the Porcellio laevis woodlouse.