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[kal-si-toh-nin] /ˌkæl sɪˈtoʊ nɪn/
noun, Biochemistry
a polypeptide hormone that participates in the regulation of calcium levels in vertebrates by inhibiting loss of calcium from bone to the blood.
Origin of calcitonin
1960-65; calci- + tone + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for calcitonin
  • It also produces calcitonin which is one of the regulators of calcium levels in the blood.
  • Medullary carcinoma of the thyroid is cancer of the thyroid gland that starts in cells that release a hormone called calcitonin.
  • calcitonin is a medicine that slows the rate of bone loss and relieves bone pain.
  • It also releases calcitonin, which plays a role in calcium balance and will not be discussed here.
British Dictionary definitions for calcitonin


a hormone secreted by the thyroid that inhibits the release of calcium from the skeleton and prevents a build-up of calcium in the blood Also called thyrocalcitonin Compare parathyroid hormone
Word Origin
C20: from calci- + ton(ic) + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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calcitonin in Medicine

calcitonin cal·ci·to·nin (kāl'sĭ-tō'nĭn)
A peptide hormone, produced by the thyroid gland in humans, that acts to lower plasma calcium and phosphate levels without augmenting calcium accretion. Also called thyrocalcitonin.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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calcitonin in Science
A peptide hormone secreted by the thyroid gland that stimulates bone formation and lowers blood calcium and phosphate levels.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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