la silla

la silla
chair, seat; saddle
1. Todo el mundo estaba muy confundido cuando el actor se puso a hablarle a una silla en la conferencia.
Everyone was very confused when the actor started talking to a chair in the conference.
2. Mi primo a menudo monta a caballo sin usar silla, pero yo no me atrevo.
My cousin often rides horses without using a saddle, but I don't dare.
If you want to talk about a wheelchair, use "silla de ruedas." A rocking chair, though, is known as a "mecedora."