Ymarfer, n. practice, exercise
Ymarferiad, n. a practising
Ymarferu, v. to practise
Ymarllwys, n. self-emptying
Ymaröi, v. to bear with
Ymaröus, a. long suffering
Ymarwedd, n. behaviour
Ymateb, n. a mutual answer
Ymattreg, n. a mutual pause
Ymattal, n. self-restraint