thorium dioxide
noun
: 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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“Thorium dioxide.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/thorium%20dioxide. Accessed 28 Apr. 2024.
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