A radioactive element of the alkali-metal group discovered as a disintegration product of actinium
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Noun
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
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Usage Examples
Misspelled Form
Fr, Fr, r, Fr, Fer, F4r, F5r, Ftr, Ffr, Fe, F4, F5, Ft, Ff, Fre, Fr4, Fr5, Frt, Frf.