syn·tac·tic 
(sĭn-tăktĭk) or syn·tac·ti·cal (-tĭ-kəl)
(sĭn-tăktĭk) or syn·tac·ti·cal (-tĭ-kəl)adj.
Of, relating to, or conforming to the rules of syntax.
[Greek suntaktikos, putting together, from suntaktos, constructed, from suntassein, to construct; see SYNTAX.]
syn·tacti·cal·ly adv.