Kalmar "hendiadys" ta samo asali ne daga tushen Girkanci "kano" (daya) da "dia" (ta). A cikin ilimin harshe, hendidyys yana nufin siffa ta magana inda ake amfani da kalmomi biyu da aka haɗa ta hanyar haɗin gwiwa, yawanci "da", don bayyana ra'ayi mai rikitarwa. Ɗayan kalmomin yana aiki azaman mai gyarawa ko siffa mai gyarawa zuwa ɗayan, wanda shine kai ko babban suna. Tasirin hendiadys shine don jaddada ra'ayin da kalmomin biyu suka bayyana tare.Misali, "zafi da yaji" misali ne na hendidyys saboda "mai yaji" yana canza "zafi" don ƙirƙirar ra'ayin guda ɗaya. "sosai yaji." Hakazalika, "alfahari da kwarin gwiwa" na iya zama hendidyys, inda "amincewa" ke canza "alfahari" don ƙirƙirar ra'ayi ɗaya na "tabbatar da kai."