[ 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

First recorded in 1960–65; calci- + tone + -in2 Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for calcitonin


/ (ˌkælsɪˈtəʊnɪn) /


a hormone secreted by the thyroid that inhibits the release of calcium from the skeleton and prevents a build-up of calcium in the bloodAlso called: thyrocalcitonin Compare parathyroid hormone

Word Origin for calcitonin

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

Medicine definitions for calcitonin


[ kăl′sĭ-tōnĭn ]


A peptide hormone, produced by the thyroid gland in humans, that acts to lower plasma calcium and phosphate levels without augmenting calcium accretion.thyrocalcitonin
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for calcitonin


[ kăl′sĭ-tōnĭn ]

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.