a regenerated, semisynthetic textile filament made from cellulose, cotton linters, or wood chips by treating these with caustic soda and carbon disulfide and passing the resultant solution, viscose, through spinnerets.
fabric made of this filament.
made of rayon.

1920–25; apparently based on ray1

half-rayon, adjective
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World English Dictionary
rayon (ˈreɪɒn)
1.  any of a number of textile fibres made from wood pulp or other forms of cellulose
2.  any fabric made from such a fibre
3.  (modifier) consisting of or involving rayon: a rayon shirt
[C20: from French, from Old French rairay1]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1924, chosen by National Retail Dry Goods Association of America, probably from Fr. rayon "beam of light, ray," from rai (see ray (1)), which was also used in M.E. as a name for a type of cloth. So called because it is shiny. A more marketable alternative than the original patented
name, artificial silk (1884), or the intervening attempt, Glos, which was "killed by ridicule" ("Draper's Record," June 14, 1924)
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
People stand in in line for hours waiting to buy the old, wartime rayon
  stockings rather than nylons.
It's made of organic cotton and rayon from bamboo, and would work equally well
  with slacks or a dress.
But shorts of ribbed cotton, viscose, rayon or silk are increasingly popular.
Rayon fibers used in the production of nonwoven wipes are artificial fibers
  derived from wood pulp cellulose.
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