The sinuses are formed in four right-left pairs. Define sinus. sinus synonyms, sinus pronunciation, sinus translation, English dictionary definition of sinus. The sinoatrial (or sinus) node is the natural pacemaker of the heart. Sinus: 1. A depression or cavity formed by a bending or curving. Also learn about conditions, tests, and treatments affecting the sinuses. Sinus cavities produce the mucus that nasal passages need to work effectively. Medical Author: William C. Shiel Jr., MD, FACP, FACR; Tachycardia, sinus: A fast heartbeat (tachycardia) because of rapid firing of the sinoatrial (sinus) node. Medical Definition of Tachycardia, sinus. Sinusitis is a common condition defined as inflammation of the paranasal sinuses. Read medical definition of Sinus. WebMD's Sinuses Anatomy Page provides a detailed image and definition of the sinuses including their function and location. An air-filled cavity in a dense portion of a skull bone.The sinuses decrease the weight of the skull. sinus n. 1.
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