cynosure (n.)

1590s, from Middle French cynosure (16c.), from Latin Cynosura, literally "dog's tail," the constellation (now Ursa Minor) containing the North Star, the focus of navigation, from Greek kynosoura, literally "dog's tail," from kyon (genitive kynos; from PIE root *kwon- "dog") + oura "tail" (see arse).

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