Pol`y*tech"nic (p&obreve;l`&ibreve;*t&ebreve;k"n&ibreve;k), a. [Gr. poly`technos; poly`s many + te`chnh an art: cf. F. polytechnique.] Comprehending, or relating to, many arts and sciences; -- applied particularly to schools in which many branches of art and science are taught with especial reference to their practical application; also to exhibitions of machinery and industrial products.