mesothorium
[ mez-oh-thawr-ee-uh m, -thohr-, mes-, mee-zoh-, -soh- ]
/ ˌmɛz oʊˈθɔr i əm, -ˈθoʊr-, ˌmɛs-, ˌmi zoʊ-, -soʊ- /
noun Chemistry.
one of two radioactive decay products of thorium, an isotope of radium or actinium.
Words nearby mesothorium
mesotendineum,
mesothelioma,
mesothelium,
mesotherapy,
mesothorax,
mesothorium,
mesotron,
mesovarium,
mesozoa,
mesozoan,
mesozoic
British Dictionary definitions for mesothorium
mesothorium
/ (ˌmɛsəʊˈθɔːrɪəm) /
noun
physics obsolete
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