1.  nuclear(a = adj.all) atomic - (weapons) deriving destructive energy from the release of atomic energy; "nuclear war"; "nuclear weapons"; "atomic bombs"
Antonym: conventional

2.  nuclear(a = adj.pert) - of or relating to or constituting the nucleus of an atom; "nuclear physics"; "nuclear fission"; "nuclear forces"

3.  nuclear(a = adj.pert) - of or relating to or constituting the nucleus of a cell; "nuclear membrane"; "nuclear division"

4.  nuclear(s = adj.all) - constituting or like a nucleus; "annexation of the suburban fringe by the nuclear metropolis"; "the nuclear core of the congregation"

   Of or pertaining to a nucleus; as, the nuclear spindle (see Illust. of Karyokinesis) or the nuclear fibrils of a cell; the nuclear part of a comet, etc. [1913 Webster]

1.  of, pertaining to, or using nuclear weapons; a nuclear exchange, i.e. a reciprocal bombardment by nuclear weapons.. [PJC]

2.  Of, pertaining to, or powered by atomic energy; same as nuclear-powered; as, a nuclear submarine; a nuclear power plant. [PJC]

3.  Of or pertaining to nations possessing nuclear weapons; as, the nuclear club. [PJC]

nuclear, adj.
1 of, relating to, or constituting a nucleus.
2 using nuclear energy (nuclear reactor).
3 having nuclear weapons.

Idiom:
nuclear bomb a bomb involving the release of energy by nuclear fission or fusion or both. nuclear disarmament the gradual or total reduction by a State of its nuclear weapons. nuclear energy energy obtained by nuclear fission or fusion. nuclear family a couple and their children, regarded as a basic social unit. nuclear fission a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy. nuclear force a strong attractive force between nucleons in the atomic nucleus that holds the nucleus together. nuclear-free free from nuclear weapons, power, etc. nuclear fuel a substance that will sustain a fission chain reaction so that it can be used as a source of nuclear energy. nuclear fusion a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy. nuclear magnetic resonance the absorption of electromagnetic radiation by a nucleus having a magnetic moment when in an external magnetic field, used mainly as an analytical technique and in body imaging for diagnosis.

Usage:
Abbr.: NMR, nmr. nuclear physics the physics of atomic nuclei and their interactions, esp. in the generation of nuclear energy. nuclear power
1 electric or motive power generated by a nuclear reactor.
2 a country that has nuclear weapons. nuclear reactor a device in which a nuclear fission chain reaction is sustained and controlled in order to produce energy. nuclear umbrella supposed protection afforded by an alliance with a country possessing nuclear weapons. nuclear warfare warfare in which nuclear weapons are used. nuclear waste any radioactive waste material from the reprocessing of spent nuclear fuel. nuclear winter obstruction of sunlight as a potential result of nuclear warfare, causing extreme cold.

Etymology:
NUCLEUS + -AR(1)

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