a rotating device that adds twist to the slubbing or roving and winds the stock onto a spindle or bobbin in a uniform manner.
a similar device for adding twist to yarn.

1400–50; late Middle English; see fly1, -er1

flier, flyer. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
flyer or flier (ˈflaɪə)
1.  a person or thing that flies or moves very fast
2.  an aviator or pilot
3.  informal a long flying leap; bound
4.  a fast-moving machine part, esp one having periodic motion
5.  Compare winder a rectangular step in a straight flight of stairs
6.  athletics an informal word for flying start
7.  chiefly (US) a speculative business transaction
8.  a small handbill
flier or flier

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

also flier, mid-15c., "something that flies," agent noun of fly (v.1). Meaning "something that goes fast" is from 1795; that of "aviator" is from 1934. Meaning "small handbill or fly-sheet" is from 1889, U.S. slang (originally especially of police bulletins), on notion of "made
to be scattered broadcast." Related: Fliers; flyers.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

fly (flī)
Any of numerous two-winged insects of the order Diptera.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
fly   (flī)  Pronunciation Key 
Any of numerous insects of the order Diptera, having one pair of wings and large compound eyes. Flies include the houseflies, horseflies, and mosquitoes. See more at dipteran.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
If problems do arise, an early flight offers flyers a better chance to rebook
  on an alternate flight.
The look on their faces is pure joy, especially the first time flyers.
Flyers and slides are both about catching the attention and being
  comprehensible at a glance.
Making air travel more expensive, say through hefty fuel taxes, would put off
  price-sensitive leisure flyers.
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