Arddawn, n. a talent
Arddedfol, a. institutional
Arddedig, a. tilled, ploughed
Arddeddf, n. an institute
Arddefod, n. a ceremony
Arddefodol, a. ceremonial
Arddelw, n. a claim, a challenge; an assertion, v. to claim; to assert
Arddelwad, n. an averment
Ardderchafad, Ardderchaflad, n. advancement
Ardderchafu, to elevate highly