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pinion1

[pin-yuh n] /ˈpɪn yən/
noun
1.
Machinery.
  1. a gear with a small number of teeth, especially one engaging with a rack or larger gear.
  2. a shaft or spindle cut with teeth engaging with a gear.
2.
Metalworking. a gear driving a roll in a rolling mill.
Origin
1650-1660
1650-60; < French pignon cogwheel, Middle French peignon, derivative of peigne comb, variant of pigne < Latin pectin- (stem of pecten) comb; see pecten
Related forms
pinionless, adjective
pinionlike, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for pinionless

pinion1

/ˈpɪnjən/
noun
1.
(mainly poetic) a bird's wing
2.
the part of a bird's wing including the flight feathers
verb (transitive)
3.
to hold or bind (the arms) of (a person) so as to restrain or immobilize him
4.
to confine or shackle
5.
to make (a bird) incapable of flight by removing that part of (the wing) from which the flight feathers grow
Word Origin
C15: from Old French pignon wing, from Latin pinna wing

pinion2

/ˈpɪnjən/
noun
1.
a cogwheel that engages with a larger wheel or rack, which it drives or by which it is driven
Word Origin
C17: from French pignon cogwheel, from Old French peigne comb, from Latin pecten comb; see pecten
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
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Word Origin and History for pinionless

pinion

n.

"wing joint, segment of a bird's wing," mid-15c., from Old French pignon "wing-feather, wing, pinion" (c.1400), from Vulgar Latin *pinnionem (nominative *pinnio), augmentative of Latin pinna "wing" (see pin (n.)).

"small wheel with teeth to gear with a larger one" (as in rack and pinion), 1650s, from French pignon "pinion" (16c.), literally "gable," from Old French pignon "pointed gable, summit," from Vulgar Latin *pinnionem, augmentative of Latin pinna "battlement, pinnacle" (see pin (n.)).

v.

"disable by binding the arms," 1550s, older in English than literal sense "cut or bind the pinions (of a bird's wing) to prevent flying" (1570s); from pinion (n.1). Related: Pinioned.

Online Etymology Dictionary, © 2010 Douglas Harper
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