Synthetical :: Synthetical (a.) Of or pertaining to synthesis; consisting in synthesis or composition; as, the synthetic method of reasoning, as opposed to analytical..
Synthetically :: Synthetical (a.) Comprising within itself structural or other characters which are usually found only in two or more diverse groups; -- said of species, genera, and higher groups. See the Note under Comprehensive, 3..
Synthetize :: Synthetically (adv.) In a synthetic manner.