lodestar (n.) Look up lodestar at Dictionary.com
late 14c. (late 13c. as a surname), an old name for the pole star as the star that "leads the way" in navigation; from lode (n.) + star (n.). Figurative use from late 14c. Compare lodestone. Similar formation in Old Norse leiðarstjarna, German Leitstern, Danish ledestjerne.