autacoidal

autacoid

[aw-tuh-koid]
noun Physiology.
any physiologically active internal secretion, especially one of uncertain classification, as histamine or prostaglandin.

Origin:
1910–15; aut- + Greek ák(os) remedy + -oid

autacoidal, adjective
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World English Dictionary
autacoid (ˈɔːtəˌkɔɪd)
 
n
physiol any natural internal secretion, esp one that exerts an effect similar to a drug
 
[C20: from auto- + Greek akos cure + -oid]

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American Heritage
Medical Dictionary

autacoid au·ta·coid or au·to·coid (ô'tə-koid')
n.
An organic substance, such as a hormone, produced in one part of an organism and transported by the blood or lymph to another part of the organism where it exerts a physiologic effect on that part.

The American Heritage® Stedman's Medical Dictionary
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