pinhão
1. A small gear that engages with a larger gear or rack in mechanical systems
The pinion gear meshed smoothly with the rack.
O pinhão engrenava suavemente com a cremalheira.
2. The outer part of a bird's wing, including the flight feathers
The bird's pinion was damaged, preventing it from flying.
O pinhão da asa do pássaro estava danificado, impedindo-o de voar.
3. To restrain or bind someone's arms, especially to prevent escape
The guards pinioned the prisoner's arms behind his back.
Os guardas prenderam os braços do prisioneiro nas costas.
4. To confine or restrict movement
She felt pinioned by her responsibilities.
Ela se sentia restrita por suas responsabilidades.
In English, 'pinion' is primarily used in mechanical engineering contexts in both American and Brazilian Portuguese-speaking communities. The ornithological usage is more technical and less common in everyday speech. In Portuguese, 'pinhão' is the standard term for the small gear in mechanical systems and is widely understood in industrial and automotive sectors.
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