Noun
masurium (uncountable)
(obsolete) The metallic element technetium.
Her suggestion was not taken seriously at the time because her team had not carried out any experiments with uranium, and its claim to have discovered masurium ( technetium ) was disputed. Source: Internet
We can find no other plausible explanation for the Noddacks' data than that they did indeed detect fission "masurium." Source: Internet