early 14c. (late 12c. as a surname), pouche, "bag worn on one's person for carrying things," especially (late 14c.) "small bag in which money is carried," from Anglo-French puche, Old North French pouche (13c.), Old French poche "purse, poke," all from a Germanic source (compare Old English pocca "bag;" see poke (n.1)). Extended to sac-like cavities in animal bodies from c. 1400.

1560s, "put in a pouch;" 1670s, "to form a pouch, swell or protrude," from pouch (n.). Related: Pouched; pouching.

"of or pertaining to the implacental mammals," who usually are provided with a pouch for their young, 1690s, with -al (1) + Modern Latin marsupialis "having a pouch," coined from Late Latin marsupium "pouch, purse" (Classical Latin marsuppium), from Greek marsipion, diminutive of marsipos, marsippos "bag, pouch, purse," a word of foreign or Pre-Greek origin. As a noun, "a marsupial animal, an implacental didelphian mammal," from 1805.

in biology, "sac or pouch serving as a receptacle for eggs," 1875; see oo- "egg" + cyst.

also mail-bag, "bag in which the public mail is carried," 1794, from mail (n.1) + bag (n.). Mail-pouch in the same sense is by 1838. The Mail Pouch chewing tobacco brand painted its advertisements on barns across the middle of the U.S. from 1891 to 1992.

1630s, "pertaining to the gall bladder," from French cystique (16c.), from Modern Latin cysticus, from Greek kystis "bladder, pouch," which is of unknown origin. Meaning "pertaining to a cyst" is from 1713. Cystic fibrosis coined in 1938.

furred leather pouch, 1753, sparren, from Gaelic sporan, Irish sparan "purse," of uncertain origin. Familiarized by Walter Scott.

"bladder-like bag or vesicle in an animal body," 1713, from Modern Latin cystis (in English as a Latin word from 1540s), from Greek kystis "bladder, pouch," which is of uncertain etymology.