From WordNet (r) 3.0 (2006): atomic number 99 n 1: a radioactive transuranic element produced by bombarding plutonium with neutrons [syn: einsteinium, Es, E, atomic number 99]
atomic number 99 n 1: a radioactive transuranic element produced by bombarding plutonium with neutrons [syn: einsteinium, Es, E, atomic number 99]
