Ys, n. ardency; a consuming: v. is, hath a being, exists. Er ys dyddiau, a good while
Ysbagiad, n. a clawing
Ysbagu, v. to claw, to clutch
Ysbryd, n. a spirit, a ghost
Ysbryrdiaeth, n. spirituality
Ysbrydol, a. spiritual, ghostly
Ysbrydoldeb, n. spiritualness
Ysbrydoli, v. to spiritualise
Ysbrydoliaeth, n. inspiration
Ysbytty, n. an hospital