You know what it looks like… but what is it called?
TAKE THE QUIZ“125”
The following 2 entries include the term 125.
1,25-dihydroxycholecalciferol
nouniodine-125
noun: a light radioactive isotope of iodine that has a mass number of 125 and a half-life of 60 days, gives off soft gamma rays, and is used as a tracer in thyroid studies and as therapy in hyperthyroidism
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Merriam-Webster unabridged