high-level radioactive waste(n = noun.substance) - radioactive waste that left in a nuclear reactor after the nuclear fuel has been consumed;
is a kind of radioactive waste

alkali waste, body waste, food waste, high-level, high-level formatting, high-level language, human waste, lay waste, lay waste to, laying waste, low-level radioactive waste, permissive waste, radioactive, radioactive dating, radioactive decay, radioactive dust, radioactive iodine excretion test, radioactive iodine test, radioactive iodine uptake test, radioactive material, radioactive waste, toxic industrial waste, toxic waste, toxic waste area, toxic waste dump, toxic waste site, waste, waste away, waste basket, waste material, waste matter, waste of effort, waste of energy, waste of material, waste of money, waste of time, waste one's time, waste paper, waste pipe, waste product, waste time