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