Pysgyddiaeth, n. ichthyology
Pystylad, n. restless motion
Pystyled, v. to be agog; to caper
Pystylwyn, n. a saddle crupper
Pyth, n. a period; a world: adv. ever, never
Pythefnos, n. a fortnight
Pythol, a. ever, eternal
Python, n. system of the world
Pythori, v. to be anxious
Pyw, n. a member, a limb: a. in order; complete