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inoh

sinus

/ˈsaɪ.nəs/

Meaning 1

A hollow cavity in the skull

“She felt pressure in her sinus during the cold.”
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Illustration of sinus: A hollow cavity in the skull

Meaning 2

A cavity in the skull near the nose.

“He felt pressure in his sinus during the flight.”
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Illustration of sinus: A cavity in the skull near the nose.