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sinus [sinuses]▼◼◼◼irregular noun[UK: ˈsaɪ.nəs] [US: ˈsaɪ.nəs]
frontal sinus [frontal sinuses]▼◼◼◻noun[UK: ˈfrʌn.tl̩ ˈsaɪ.nəs] [US: ˈfrʌn.tl̩ ˈsaɪ.nəs]
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