名詞 pillion:

1. a seat behind the rider of a horse or motorbike etc.

pil.lion

n.（名詞）
A pad or cushion for an extra rider behind the saddle on a horse or motorcycle.
座墊，后座：在馬鞍或摩托車(chē)座位后給另一乘坐者準(zhǔn)備的墊子或鞍墊
A bicycle or motorcycle saddle.
車(chē)座：自行車(chē)或摩托車(chē)坐墊

來(lái)源：
Probably from Scottish Gaelic pillean [diminutive of] peall [rug]
可能源自 蘇格蘭的蓋爾語(yǔ) pillean [] peall的小后綴 [小地毯]
or Irish Gaelic pillín [diminutive of] pell [rug]
或 愛(ài)爾蘭蓋爾語(yǔ) pillín [] pell的小后綴 [小地毯]
both from Old Irish pell
都源自 古愛(ài)爾蘭語(yǔ) pell
from Latin pellis [animal skin] * see pel- 3
源自 拉丁語(yǔ) pellis [動(dòng)物皮] *參見(jiàn) pel- 3