a photographic emulsion in the form of a thick block, used to record the tracks of elementary particles.
noun 1. energy released by reactions within atomic nuclei, as in nuclear fission or fusion. noun 1. energy released during a nuclear reaction as a result of fission or fusion Also called atomic energy nuclear energy Energy obtained from nuclear reactions.
noun 1. a social unit composed of two parents and one or more children. noun 1. (sociol, anthropol) a primary social unit consisting of parents and their offspring Compare extended family nuclear family n. A family unit consisting of a mother and father and their progeny. A type of family made up only of parents […]
noun 1. (def 2). noun 1. the splitting of an atomic nucleus into approximately equal parts, either spontaneously or as a result of the impact of a particle usually with an associated release of energy Sometimes shortened to fission Compare nuclear fusion
adjective not having or allowing nuclear weapons or materials, esp. within a specified area; also, not having nuclear power Examples The city declared itself a nuclear-free zone.