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poly1

[pol-ee]
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noun, plural pol·ies.
  1. Informal. polyester(def 2): a blend of poly and cotton.
  2. a fabric or garment made of polyester.
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adjective
  1. made of or containing polyester: a poly swimsuit.
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Origin of poly1

by shortening
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for polies'

poly

noun plural polys
  1. informal short for polytechnic
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adjective
  1. informal short for polyester
  2. informal short for polythene
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012