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Definition of sinus noun from the Oxford Advanced Learner's Dictionary

sinus

noun
 
/ˈsaɪnəs/
 
/ˈsaɪnəs/
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  1. any of the hollow spaces in the bones of the head that are connected to the inside of the nose
    • blocked sinuses
    Topics Bodyc2
    Word Originlate Middle English (in the medical sense): from Latin, literally ‘a recess, bend’.
See sinus in the Oxford Advanced American Dictionary
Check pronunciation: sinus

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aspiration
noun
 
 
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