thorium

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thorium

 [thor´e-um]
a chemical element, atomic number 90, atomic weight 232.038, symbol Th. (See Appendix 6.)

tho·ri·um (Th),

(thō'rē-ŭm),
A radioactive metallic element; atomic no. 90, atomic wt. 232.0381. 232Th, the only naturally occurring nuclide, with a half-life of 14 × 109 years, is used in colloidal form in electron microscopy as a stain for acid mucopolysaccharides.
[Thor, Norse god of thunder]

thorium

/tho·ri·um/ (thor´e-um) chemical element, at. no. 90, symbol Th.

thorium (Th)

[thôr′ē·əm]
Etymology: ONorse, Thor, god of thunder
a heavy grayish radioactive metallic element. Its atomic number is 90; its atomic mass (weight) is 232.04. Thorium is used in nuclear medicine and in radiation therapy.

tho·ri·um

(Th) (thōr'ē-ŭm)
A radioactive metallic element; atomic no. 90, atomic wt. 232.0381. 232Th, the only naturally occurring nuclide, with a half-life of 14 × 109 years, is used in colloidal form in electron microscopy as a stain for acid mucopolysaccharides.
[Thor, Norse god of thunder]

thorium

a chemical element, atomic number 90, atomic weight 232.038, symbol Th. See Table 6. Formerly used as a radiographic contrast medium.