mar·su·pi·um n.; pl. marsupia , Anat. & Zool. (a) The pouch, formed by a fold of the skin of the abdomen, in which marsupials carry their young; also, a pouch for similar use in other animals, as certain Crustacea. (b) The pecten in the eye of birds and reptiles. See Pecten.
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marsupium
n : an external abdominal pouch in most marsupials where newborn
offspring are suckled
[also: marsupia (pl)]