Relating to or involving the diaphragm, the large muscle that separates the chest from the abdomen and controls breathing.
From Greek diaphragma (partition, barrier), from dia- (through) + phrassein (to fence), plus the adjective suffix -al, describing the anatomical structure that 'fences off' the abdomen from the chest.
Your diaphragm is the most important muscle for breathing, but most people never think about it—it automatically contracts and relaxes thousands of times a day, and when you sing, laugh, or speak loudly, you're consciously controlling this normally automatic muscle.
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