thoron

About 0.04 uses per million words.

Meaning

1. noun Radon-220 (22086Rn; symbol Tn), an isotope of radon
2. noun Alternative form of thorin (“C16H11AsN2O10S2.2Na”).

Similar words

exthorio actinon thorate radon radonate dithorium phthor acton actineon orthonitrate

Often followed by

and progeny in decay concentration is daughters gas concentrations