Kalmar "dioecious" (Ina ɗauka wannan ita ce kalmar da kuke nufi) sifa ce da ke bayyana siffar halittar tsiro. Wani nau'in tsire-tsire na dioecious shine wanda a cikinsa ake samun gabobin haihuwa na namiji da na mace akan tsirrai daban-daban. Watau, akwai tsire-tsire maza da tsire-tsire na mata, kuma ba za su iya yin takin kansu ba.Kalmar "dioecious" ta fito ne daga kalmomin Helenanci "dioikos" (ma'ana "gidaje biyu") da "oikos" (ma'ana "gida" ko "mazauni"). Kishiyar dioecious ita ce “monoecious,” wanda ke bayyana tsiron da ke da gabobin haihuwa na namiji da na mace a kan shuka iri ɗaya.