interactant

[ in-ter-ak-tuh nt ]
/ ˌɪn tərˈæk tənt /

noun

a person or thing that interacts.
Chemistry. reactant(def 2).

Origin of interactant

First recorded in 1945–50; interact + -ant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019