thorium dioxide

noun

Medical Definition of thorium dioxide

: a refractory crystalline compound obtained usually as a dense white powder and formerly used as a contrast medium in radiography

called also thorium oxide, thorotrast

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Cite this Entry

“Thorium dioxide.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/thorium%20dioxide. Accessed 30 Oct. 2020.

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