Origin of calcitonin
calci- + -tonin (as in serotonin)
First Known Use: 1961
Medical Definition of calcitonin
1: a polypeptide hormone especially from the thyroid gland that tends to lower the level of calcium in the blood plasma—called also
2: a synthetic or recombinant form of calcitonin used to treat Paget's disease of bone and postmenopausal osteoporosis <Calcitonin administered by means of a nasal spray is an antiresorptive agent that has limited efficacy in reducing the risk of vertebral fractures and lacks efficacy in preventing hip fracture.—Murray J. Favus, The New England Journal of Medicine, 18 Nov. 2010>
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