- nuclear reactor, reactor - (physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements
--1 is a kind of apparatus, setup
--1 has parts: control rod; core; moderator
--1 has particulars:atomic pile, atomic reactor, pile, chain reactor; breeder reactor; fast reactor; gas-cooled reactor; liquid metal reactor; thermal reactor; thermonuclear reactor, fusion reactor; water-cooled reactor