/ ˈsɪnəzjʊə(r); ˈsaɪn-; -ʃʊə(r); NAmE ˈsaɪnəʃʊr; ˈsɪn-/ noun
[ sing. ] ( formal ) a person or thing that is the centre of attention :
Ruth was the cynosure of all eyes.
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WORD ORIGIN
late 16th cent.: from French , or from Latin cynosura , from Greek kunosoura dog's tail (also Ursa Minor), from kuōn , kun- dog + oura tail. The term originally denoted the constellation Ursa Minor, or the pole star which it contains, long used as a guide by navigators.