nuclear UK /ˈnjuː.klɪə(ɹ)/US /ˈn(j)u.kli.ɚ/adjective 8noun 2forms 1phrases 1 adjective8 •Pertaining to the nucleus of an atom. •connected with the energy atoms give off when they split or join, as in power stations and bombs •Relating to a weapon that derives its force from rapid release of energy through nuclear reactions. •Having nuclear weapons. •Relating to, being of, or comprising the nuclear family. •(figurative) Involving an extreme course of action, or one with severe consequences.The nuclear approach is the simpler of the two. When two constraints conflict, you can kill one of them. — 2013 •Pertaining to the nucleus of a cell.However, the DNA in a bacterial cell is a single circular molecule and there is no separate nuclear compartment. — 2011 •Pertaining to a centre around which something is developed or organised; central, pivotal.Nuclear Polynesian languages include Hawaiian and Samoan. noun2 •Nuclear power.The growth in wind capacity at first lagged behind the expansion of nuclear installations, but then it started to grow faster and is now outpacing nuclear. — 2015 •Nuclear weapon formsnuclears Phrases with nuclear nuclear optionIn resolving a problem, the possible course of action that is considered the most extreme because of its collateral consequences.