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As a noun 'Sinus' . it plural is 'Sinii'. NOT 'sinuses' , which refers to a verb.

Many English language nouns ending is 'us' as the singular. have ' --ii' as plurtal.

e.g.

Radius / Radii

Focus / Foci

Hence Sinus / Sinii

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lenpollock

Lvl 16
4mo ago

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