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1. Oxford Dictionary

   sinus

   • IPA[ˈsʌɪnəs]

   英式

   • n.
     a cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.；an irregular venous or lymphatic cavity, reservoir, or dilated vessel.

   • noun: sinus, plural noun: sinuses

2. • 釋義

   n.

   名詞

   • 1. a cavity within a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities.
   • ▪ an irregular venous or lymphatic cavity, reservoir, or dilated vessel.
   • ▪ an infected tract leading from a deep-seated infection and discharging pus to the surface.
   • ▪ a rounded notch between two lobes on the margin of a leaf or petal.
   • 2. relating to or denoting the sino-atrial node of the heart or its function of regulating the heartbeat sinus rhythm sinus tachycardia