Arddwr, n. a ploughman
Arddwriaeth, n. agriculture
Arddwrn, n. a wrist
Arddwyo, v. to manage
Arddygraff, n. orthography
Arddyled, n. obligation, duty
Arddyledog, a. under obligation
Arddyledus, a. highly incumbent
Arddymchwelyd, v. to overwhelm
Arddyrch, a. uplifted, exalted