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calcitonin

[kal-si-toh-nin] /ˌkæl sɪˈtoʊ nɪn/
noun, Biochemistry
1.
a polypeptide hormone that participates in the regulation of calcium levels in vertebrates by inhibiting loss of calcium from bone to the blood.
Origin
1960-1965
1960-65; calci- + tone + -in2
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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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

calcitonin

/ˌkælsɪˈtəʊnɪn/
noun
1.
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)
n.
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
calcitonin
  (kāl'sĭ-tō'nĭn)   
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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Encyclopedia Article for calcitonin

a protein hormone secreted in humans and other mammals by parafollicular cells in the thyroid gland, and in birds, fishes, and other nonmammalian vertebrates by cells of the ultimobranchial bodies, which are discrete calcitonin-secreting glands. Calcitonin lowers the concentration of calcium in the blood when it rises above the normal value. It has the opposite effect of parathyroid hormone (parathormone).

Learn more about calcitonin with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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