Calcitonin Definition
 kălsĭ-tōnĭn 
    noun
  
 A polypeptide hormone regulating the balance of calcium and phosphate in the blood by direct action on bone and kidney: in mammals, secreted by the thyroid.
 Webster's New World 
(biochemistry) Thyrocalcitonin.
Wiktionary 
Synonyms: 
  Origin of Calcitonin
- calci– ton(e) –in - From American Heritage Dictionary of the English Language, 5th Edition 
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