polaris

What it means

1. astronomyα Ursae Minoris, a trinary star in the constellation Ursa Minor located near the north celestial pole for the last 1500 years.

   Near-synonyms: Pole Star, Lode Star, North Star (coinstantial for centuries); pole star

   Synonyms: Alpha Ursae Minoris, α Ursae Minoris, Pole Star, Lode Star, North Star, pole star

2. A type of U.S. ballistic missile, capable of carrying a nuclear warhead and designed to be launched from a submarine.

   Tremble, you weaklings, cower in fear / I am your ruler — land, sea, and air / Immense in my girth, erect I stand tall / I am a nuclear murderer, I am Polaris"

   1990, “Rust in Peace… Polaris”, in Dave Mustaine (lyrics), Dave Mustaine (music), Rust in Peace, performed by Megadeth

In a sentence

Near-synonyms: Pole Star, Lode Star, North Star (coinstantial for centuries); pole star

Where it comes from

1. Latinstēlla polāris“pole star”
2. EnglishPolaris

From Latin stēlla polāris (“pole star”).