immunochemical UK /ˌɪˌmjuːnəʊˈkɛmɪkəl/US /ˌɪˌmjuːnoʊˈkɛmɪkəl/adjective 1noun 1forms 1 adjective1 •Pertaining to immunochemistry. noun1 •Any immunoactive chemical compound. formsimmunochemicals