Nuclear material of the type most suitable for nuclear weapons, i.e. uranium enriched to 93 percent uranium-235 or plutonium that is primarily plutonium-239.
Refers to nuclear material that is most suitable for the manufacture of nuclear weapons- e.g., uranium (U) enriched to 93 percent U-235 or plutonium (Pu) that is over 90 percent Pu-239. Crude weapons can be fabricated from lower-grade material.
of a quality adequate for use in weapons (especially in weapons of mass destruction); "weapons-grade plutonium"; "weapons-grade anthrax"