Yspaciad, n. a stacking
Ystacio, v. to pile, to heap
Ystad, n. a state, a condition
Ystadaeth, n. statistics
Ystaen, n. stain; tin: a. stained
Ystaeniad, n. a staining; a tinning
Ystafell, n. a chamber, a room
Ystafellog, a. having a room
Ystafellu, v. to form a room
Ystafellydd, n. a chamberlain