ursa : Idioms & Phrases

• noun a constellation outside the zodiac that rotates around the North Star
  Great Bear.
  

WordNet

• L., the Great Bear, one of the most conspicuous of the northern constellations. It is situated near the pole, and contains the stars which form the Dipper, or Charles's Wain, two of which are the Pointers, or stars which point towards the North Star.

Webster 1913

• noun a constellation outside the zodiac that rotates around the North Star
  Little Bear.
  

WordNet

• L., the Little Bear, the constellation nearest the north pole. It contains the north star, or polestar, which is situated in the extremity of the tail.

Webster 1913