In biology, a diaphragm is a muscle in your chest that helps you breathe. It moves up and down when you breathe in and out.
The diaphragm is a muscle that helps us breathe.
Noun: diaphragm.
Synonym: midriff.
The word "diaphragm" comes from the Greek word diaphragma, which means "partition" or "wall". It was first used in English in the 14th century to refer to the muscular partition that separates the chest from the abdomen.
What is a diaphragm?
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