Plural of abomasum; the fourth and final stomach chamber in ruminant animals like cows and sheep.
From Neo-Latin 'abomasus', combining 'ab-' (away from) and 'omasum' (the third stomach). The term was coined by anatomists to describe this chamber's position relative to the other stomachs in the digestive system.
Cows and sheep have four stomach chambers working like an assembly line—the abomasum is the only one with actual digestive juices like a human stomach, which is why it's called the 'true stomach' and is the closest to what humans have.
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