ALL meanings of mesothorium
mes·o·tho·ri·um
M m - noun mesothorium one of two radioactive decay products of thorium, an isotope of radium or actinium. 1
- noun mesothorium either of the two radioactive elements which are decay products of thorium. Mesothorium I is now called radium-228. Mesothorium II is now called actinium-228 0
- noun mesothorium a radioactive isotope of radium (mesothorium 1), formed from thorium 0
- noun mesothorium a radioactive isotope of actinium (mesothorium 2), formed from this isotope of radium 0