SINUS


Meaning of SINUS in English

/ ˈsaɪnəs; NAmE / noun

any of the hollow spaces in the bones of the head that are connected to the inside of the nose :

blocked sinuses

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WORD ORIGIN

late Middle English (in the medical sense): from Latin , literally a recess, bend .

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.