- marsupial (adj.) 1690s, with + -AL (Cf. -al) (1) + Mod.L. marsupialis "having a pouch," coined from L.L. marsupium "pouch, purse" (Classical L. marsuppium), from Gk. marsipion, dim. of marsipos "bag, pouch," of foreign, possibly oriental, origin. As a noun from 1805.
Etymology dictionary. 2014.