Meanings (ES + gloss)
piñón
The smallest gear in a gear train.
1844, Edgar Allan Poe, The Premature Burial A certain period elapses, and some unseen mysterious principle again sets in motion the magic pinions and the wizard wheels.
The usual front sprocket has teeth, which which mesh into a pinion on a shaft that carries power to the wheel through a pair of pinions at the rear.
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