pinion

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pinion

1
1. Chiefly poetic a bird's wing
2. the part of a bird's wing including the flight feathers

pinion

2
a cogwheel that engages with a larger wheel or rack, which it drives or by which it is driven

pinion

[′pin·yən]
(mechanical engineering)
The smaller of a pair of gear wheels or the smallest wheel of a gear train.
(vertebrate zoology)
The distal portion of a bird's wing.