[ C ] any of the spaces inside the head that are connected to the back of the nose窦,鼻窦
[ C ] specialized medical a space or passage filled with pus (= a thick yellow liquid) that flows to the surface of the skin窦道(脓液流出的管道)
[ U ] specialized medical the sinoatrial node (= tissue in the heart responsible for the heart's rhythm)(控制心率的)窦房节
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