pillion Meaning, Definition & Usage

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

WordNet

Pil"lion noun
Etymology
Ir. pillin, pilliun (akin to Gael. pillean, pillin), fr. Ir. & Gael. pill, peall, a skin or hide, prob. fr. L. pellis. See Pell, n., Fell skin.
Definitions
  1. A panel or cushion saddle; the under pad or cushion of saddle; esp., a pad or cushion put on behind a man's saddle, on which a woman may ride.
    His [a soldier's] shank pillion without stirrups. Spenser.

Webster 1913