UsWordNet Explorer

the 21st letter of the Roman alphabet

the conventional characters of the alphabet used to represent speech

the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe

a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

a mineral consisting of uranium oxide and trace amounts of radium and thorium and polonium and lead and helium; uraninite in massive form is called pitchblende which is the chief uranium ore

a uranium isotope with mass number 235; capable of sustaining chain reactions

the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239