lodestar

noun
🔊/ˈləʊdstɑː(r)/
🔊/ˈləʊdstɑːr/
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  1. the Pole Star北极星(海员借以导航) (= a star that is used by sailors to guide a ship)
  2. (formal) a person or principle that guides somebody’s behaviour or actions (某人行为或行动的)指导原则
  3. Word OriginMiddle English: from lode in the obsolete sense ‘way, course’ + star.