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   sinus

   /ˈsʌɪnəs/

   noun

   • 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"

   Word Origin late Middle English (in the medical sense): from Latin, literally ‘a recess, bend’.

   Scrabble Points: 5

   • S

     1

   • I

     1

   • N

     1

   • U

     1

   • S

     1

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