spinneret

[spin-uh-ret, spin-uh-ret]
noun
1.
an organ or part by means of which a spider, insect larva, or the like spins a silky thread for its web or cocoon.
2.
a metal plate or cup with tiny holes through which a chemical solution is extruded to form continuous filaments, as of rayon, nylon, or polyester.

Origin:
1820–30; spinner + -et

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
spinneret (ˈspɪnəˌrɛt)
 
n
1.  any of several organs in spiders and certain insects through which silk threads are exuded
2.  a finely perforated dispenser through which a viscous liquid is extruded in the production of synthetic fibres
 
[C18: from spinner + -et]

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

spinneret
"silk-spinning organ of a silkworm or spider," coined 1826, dim. of spinner (n.), from spin. Spinner is attested from c.1220 as "spider," from 1393 as "person who spins textile thread."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
spinneret   (spĭn'ə-rět')  Pronunciation Key 
One of the small openings in the back part of a spider or silk-producing insect larva, through which the sticky fluid that dries into silk is released.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

spinneret

in the spinning of man-made fibre, small, thimble-shaped, metal nozzle having fine holes through which a spinning solution is forced to form a filament. The viscous or syrupy solution, prepared by melting or chemically dissolving raw material, emerges from the spinneret as long fibres that are then solidified by coagulation, evaporation, or cooling

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Such a cloudy solution was sure to gum up his equipment, the spinneret operator argued.
The new spinneret works but more work needs to be done to get filaments with the desired size.
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