Definition of nuclear
1 : of, relating to, or constituting a nucleus annexation of the suburban fringe by the nuclear metropolis — W. H. Wickwar
2a : of or relating to the atomic nucleus nuclear reaction nuclear physicsb : used in or produced by a nuclear (see nuclear 2) reaction (such as fission) nuclear fuel nuclear waste nuclear energyc (1) : being a weapon whose destructive power derives from an uncontrolled nuclear reaction (2) : of, produced by, or involving nuclear weapons the nuclear age nuclear war (3) : armed with nuclear weapons nuclear powersd : of, relating to, or powered by nuclear energy a nuclear submarine the nuclear debate a nuclear plant
How do you pronounce nuclear?
Though disapproved of by many, pronunciations ending in \-kyə-lər\ have been found in widespread use among educated speakers including scientists, lawyers, professors, congressmen, U.S. cabinet members, and at least two U.S. presidents and one vice president. While most common in the U.S., these pronunciations have also been heard from British and Canadian speakers.
First Known Use of nuclear
NUCLEAR Defined for English Language Learners
Definition of nuclear for English Language Learners
: of, relating to, producing, or using energy that is created when the nuclei of atoms are split apart or joined together
: having or involving nuclear weapons
: of or relating to the nucleus of an atom
NUCLEAR Defined for Kids
Definition of nuclear for Students
1 : of, relating to, or being a nucleus (as of a cell)
2 : of or relating to the nucleus of the atom Fission is a nuclear reaction.
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
5 : relating to or powered by nuclear energy a nuclear submarine
Seen and Heard
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