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Pronunciation: ek′tō-hōr′mōn
Definition: A parahormonal chemical mediator of ecologic significance which is secreted, largely by an organism (usually an invertebrate) into its immediate environment (air or water); it can alter the behavior or functional activity of a second organism, often of the same species as that secreting the ectohormone.
See Also: ecological ectocrine
Examples: glitazone, GI cocktail, etc.
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