marsupiumEtymologyBorrowed from Latin marsūpium, from Ancient Greek μαρσίππιον (marsíppion), diminutive of μάρσιππος (mársippos, “pouch”), perhaps of Oriental origin.marsupium means The external pouch in which female marsupials rear and feed the young. Lexicurio rates it Rare gem — a strength score of 77 out of 100.nounThe external pouch in which female marsupials rear and feed the young.A brood pouch in some fishes, crustaceans and insects in the family Monophlebidae.