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Abomasum
The abomasum, also known as the maw, and the rennet-bag, and the read, is the fourth and final stomach compartment in ruminants. It secretes rennin - the artificial form of which is called rennet, and is used in cheese creation. The word abomasum is from New Latin and it was first used in English in 1706. It comes from Latin ab- + omasum "intesti.