any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc. | the 21st letter of the Roman alphabet |
a mixture containing two or more metallic elements or metallic and nonmetallic elements usually fused together or dissolving into each other when molten | a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons |
| a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine |