noun Chemistry, Physics.
- a superheavy, synthetic, radioactive element with a very short half-life. Symbol: Hs; atomic number: 108.
- a synthetic element produced in small quantities by high-energy ion bombardment. Symbol: Hs; atomic no: 108
- A synthetic, radioactive element that is produced by bombarding lead with iron ions. Its known isotopes have mass numbers ranging from 263 to 277. Hs 277 has the longest confirmed half-life (16.5 minutes). Atomic number 108. See Periodic Table.