I. Po ‧ la ‧ ris 1 /pəˈlɑːrəs, pəˈlɑːrɪs $ -ˈlæ-/ BrE AmE
a ↑ ballistic missile (=a flying weapon) fired from a ↑ submarine , which was developed in the US in the 1950s and 1960s and is a NUCLEAR WEAPON . Polaris missiles were kept by the military forces of the US and the UK until the 1990s, when they were replaced by Trident missiles.
II. Polaris 2 BrE AmE
another name for the Pole Star