fermium

• POS: Noun
• HYPHEN: fer=mi=um

CIDE DICTIONARY

fermium, n. 

 the transuranic element of atomic number 100; symbol Fm. The atomic weight of the most stable isotope, having a half-life of about 80 days, is 257. The first isotope, Fm²⁵⁵ was discovered in 1952 in the debris of a thermonuclear explosion. Other istopes have been produced in nuclear reactors and by decay of other transuranic elements.  [WordNet 1.5]

OXFORD DICTIONARY

fermium, n. Chem. a transuranic radioactive metallic element produced artificially.

Usage

Symb.: Fm.

Etymology

as FERMI + -IUM