Walrus pups are able to swim at birth and weigh between 100 and 150 pounds. Most are only children (twin births are rare), and they stay with their mothers for two years. Eventually, their small young tusks will grow up to three feet long.
Definition of nuclear for Students. 1  1 : of, relating to, or being a nucleus (as of a cell) 2  2 : of or relating to the nucleus of the atom Fission is a nuclear reaction. 3  3 : produced by a nuclear reaction nuclear energy.  4 : of, relating to, or being a weapon whose destructive power comes from an uncontrolled nuclear reaction.
â¢ NUCLEAR (adjective) The adjective NUCLEAR has 4 senses: 1. (weapons) deriving destructive energy from the release of atomic energy. 2. of or relating to or constituting the nucleus of an atom. 3. of or relating to or constituting the nucleus of a cell. 4. constituting or like a nucleus. Familiarity information: NUCLEAR used as an adjective is uncommon.