parahormone
noun
para·hor·mone
-ˈhȯr-ˌmōn
: a substance that functions as a hormone but is of relatively nonspecific nature
… the likely role of neurotensin as a parahormone in the gastrointestinal tract …—J. P. Vincent, Cellular and Molecular Neurobiology
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Merriam-Webster unabridged



