element 104(n = noun.substance) atomic number 104, rf, rutherfordium, unnilquadium, unq - a radioactive transuranic element which has been synthesized;
is a kind of chemical element, element

atomic number 104, chemical element, element, element 105, element 106, element 107, element 108, element 109, element 110, element 111, element 112, element 113, element 114, element 115, element 116, element of a cone, element of a cylinder, heating element, identity element, logic element, metallic element, picture element, plot element, rare-earth element, sensing element, threshold element, trace element, transuranic element