Polaris

n. North Star, star that is visually located near the North Pole, polestar

Polaris (α UMi / α Ursae Minoris / Alpha Ursae Minoris), more commonly known as The North Star or simply North Star, is the brightest star in the constellation Ursa Minor. It is very close to the north celestial pole (42′ away  as of 2006), making it the current northern pole star.
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In astronomy, Polaris is a star more commonly known as the North Star.
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Noun
1. the brightest star in Ursa Minor; at the end of the handle of the little dipper; the northern axis of the earth points toward it
(synonym) North Star, pole star, polar star, polestar
(hypernym) variable star, variable
(member-holonym) Little Bear, Ursa Minor

n. Polaris, North Star, star that is visually located near the North Pole, polestar

(n.)
The polestar. See North star, under North.