PILLION, noun pil'yun, [Latin pilus, hair, or from stuffing. See Pillow.] 1. A cushion for a woman to ride on behind a person on horseback. 2. A pad; a pannel; a low saddle. 3. The pad of a saddle that rests on the horse's back.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI