breeder reactor
Technical term in nuclear engineering for a reactor that produces more fissile material than it consumes.
A breeder reactor is a nuclear reactor that can produce more nuclear fuel than it consumes.
fast-breeder reactor
Compound of 増殖 (zōshoku, 'proliferation, breeding') + 炉 (ro, 'furnace, reactor'). The term is a direct calque of English 'breeder reactor'.