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sinus
mastery
/ˈsaɪ.nəs/
noun
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· context meaning
What does 'sinus' mean in this sentence?
I have sinus trouble.
1.
A cavity in the bones of the face connected to the nose
2.
A blood-filled space in the brain
3.
An abnormal passage from an infection
4.
A notch on a leaf
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