Webster's English Dictionary

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marsupium

mar.su.pi.um \-pe--*m\ \-pe--*\ n or mar.su.pia [NL, fr. L, purse, pouch, 
   fr. Gk marsypion] pl  1: an abdominal pouch formed by a fold of the skin 
   and enclosing the mammar y glands of most marsupials 2: any analogous 
   structure in lower animals for enclosing or carrying eggs  or young