| TH, Th, | Th T-helper [lymphocyte]; thenar; therapist; therapy; thoracic, thorax; thorium; throat |
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| thorium | <chemistry> A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc, and isolated as an infusible gray metallic powder which burns in the air and forms thoria; formerly called also thorinum. Symbol Th. Atomic weight 232.0. Origin: NL. See Thorite. Source: Websters Dictionary (01 Mar 1998) |
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| thorium compounds | Inorganic compounds that contain thorium as an integral part of the molecule. (12 Dec 1998) |
| thorium dioxide | <chemical> Thorium oxide (tho2). A radiographic contrast agent that was used in the early 1930s through about 1954. High rates of mortality have been linked to its use and it has been shown to cause liver cancer. Pharmacological action: carcinogens. Chemical name: Thorium oxide (ThO2) (12 Dec 1998) |
Synonyms :
Synonyms : Compounds, Thorium
Synonyms : Thorotrast, Dioxide, Thorium, Oxide, Thorium
| thorium |
a rare, heavy, gray metal, atomic number, 90; atomic weight, 232.038. The naturally occurring radioactive isotope 232Th has a half-life of 1.4 × 1010 years and is the parent element of a radioactive disintegration series.
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| thorium e. |
one member of the radioactive series derived from thorium. It is produced from thorium X, has an atomic weight of 220, its atomic number is 86, and by the loss of alpha particles it changes into thorium A.
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| thorium | a soft silvery-white tetravalent radioactive metallic element |
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| thorium | radioactive isotope of thorium with mass number 228 |
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