Ysgwyf, n. a sprinkle; a scum
Ysgydwad, n. an agitation
Ysgyfar, n. an ear
Ysgyfarn, n. an ear of a beast
Ysgyfarnog, n. a hare
Ysgfeinio, v. to form lungs
Ysgyfeiniog, a. pulmonary
Ysgyniad, n. an ascending
Ysgyrion, n. staves, splinters
Ysgyrioni, v. to shiver, to stave