Sinus
/sˈaɪnəs/
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Definition
(noun) A pouch or cavity in a bone or other tissue, especially one in the bones of the face or skull connecting with the nasal cavities (the paranasal sinus).
Sentence Examples
I have sinus trouble.
Sinus infection is a nuisance to most people.
CEFR Practice Quiz
He suffered from severe ____ pressure, making it difficult for him to breathe through his nose.