WordReference Random House Learner's Dictionary of American English © 2020
poly-, prefix. 
  • poly- comes from Greek, where it has the meaning "much, many'':polyandry (= the custom of having many husbands);polyglot (= speaking many languages).

  • Collins Concise English Dictionary © HarperCollins Publishers::
    poly- combining form
    1. more than one; many or much: polyhedron
    2. having an excessive or abnormal number or amount
    Etymology: from Greek polus much, many; related to Old English fela many
    WordReference Random House Unabridged Dictionary of American English © 2020
    pol•y  (polē),USA pronunciation n., pl.  pol•ies, adj. 
    1. Informal Termspolyester (def. 2):a blend of poly and cotton.
    2. Clothinga fabric or garment made of polyester.

    1. Textilesmade of or containing polyester:a poly swimsuit.
    • by shortening

  • a combining form with the meanings "much, many'' and, in chemistry, "polymeric,'' used in the formation of compound words:polyandrous;polyculture;polyethylene.
    • Greek, combining form representing polýs; akin to Old English fela many. See plus

  • polytechnic.

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