calcitriol

cal·cit·ri·ol

[kal-si-tree-awl, -ol]
noun
1.
Biochemistry. a vitamin D compound, C 27 H 44 O 3 , occurring in humans as a hormone derived from cholesterol, that acts in the regulation and absorption of calcium.
2.
Pharmacology. a preparation of this compound, used in the treatment of osteoporosis and bone fracture.

Origin:
1975–80; apparently calci(um) + triol

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Calcitriol is always a great word to know.
So is yttrium. Does it mean:
Symbol: Y; atomic weight: 88.905; atomic number: 39
Symbol: B; atomic weight: 10.811; atomic number: 5
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