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.
nuclear program definition, nuclear program meaning | English dictionary. Search also in: Web News Encyclopedia Images. nuclear. adj. 1 of, concerned with, or involving the nucleus of an atom. nuclear fission. 2 (Biology) of, relating to, or contained within the nucleus of a cell. a nuclear membrane. 3 of, relating to, forming, or resembling any other kind of nucleus. 4 of, concerned with, or operated by energy from fission or fusion of atomic nuclei.