Ma’anar ƙamus na “mai rai” sifa ce da ake amfani da ita wajen kwatanta jariri ko dabba da aka haifa a raye kuma yana nuna alamun rayuwa a lokacin haihuwa. Yana nufin cewa jariri ko dabba ba a haife shi ba ko kuma a haife shi matacce, amma a maimakon haka ya ɗauki numfashinsa na farko kuma yana raye a lokacin haihuwa. Ana yawan amfani da kalmar "mai rai" a cikin yanayin likita don kwatanta sakamakon haihuwa na ciki.