mar·​su·​pi·​um | \mär-ˈsü-pē-əm \
plural marsupia\-​pē-​ə \

Definition of marsupium 

1 : an abdominal pouch that is formed of a fold of the skin and encloses the mammary glands of most marsupials

2 : any of several structures in various invertebrates (such as a bryozoan or mollusk) for enclosing or carrying eggs or young

First Known Use of marsupium

1698, in the meaning defined at sense 1

History and Etymology for marsupium

borrowed from New Latin marsūpium, going back to Latin marsuppium, marsīpium "pouch, bag," borrowed from Greek marsíppion, marsýppion, from mársippos, mársipos, mársypos, mársyppos "bag, pouch" (probably of pre-Greek substratal origin) + -ion, diminutive suffix

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The first known use of marsupium was in 1698

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mar·​su·​pi·​um | \mär-ˈsü-pē-əm \
plural -pia\-​pē-​ə \

Medical Definition of marsupium 

: an abdominal pouch formed by a fold of the skin and enclosing the mammary glands of most marsupials

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a soft lustrous wool fabric with mohair

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