Kalmar "blastodisc" tana nufin tsarin da ake samu a farkon matakan ci gaban wasu kwayoyin halitta, musamman a cikin tsuntsaye da dabbobi masu rarrafe. Karamin fayafai ce mai daskarewa na sel wanda ke samuwa a saman gwaiduwa a cikin kwai. Blastodisc a ƙarshe yana haifar da amfrayo, yayin da gwaiduwa tana samar da sinadarai da ake buƙata don haɓakawa.A cikin ilmin halitta, kalmar "blastodisc" ta samo asali ne daga kalmomin Helenanci "blastos," ma'ana "bud," kuma "diskos," ma'ana "faifai." Har ila yau, wani lokaci ana kiransa da "germinal disk."