Ma'anar ƙamus na kalmar "antiparallel" ita ce:siffa(na tsarin layi biyu ko sama da haka) wanda ya kevanta da saɓani dabam-dabam, kamar ƙarshen kowane tsarin ya dace da gaba dayan kujerun sauran tsarin (s)(na wutar lantarki) da ke gudana a gaba da gaba a cikin madugu guda biyu. Biochemistry, kalmar antiparallel ana amfani da ita don bayyana madaidaicin igiyoyi biyu na helix na DNA waɗanda ke gudana ta bangarori daban-daban, tare da igiya ɗaya yana gudana daga ƙarshen 5' zuwa ƙarshen 3' ɗayan yana gudana daga ƙarshen 3' zuwa 5'. karshen.