Der, a. hard, stubborn
Dera, n. a fury, fiend, devil; the staggers
Deraidd, a. apt to be stubborn
Derbi, v. will come to pass
Derbyn, n. a receipt; v. to admit, to receive
Derbynadwy, a. receivable
Derbynfa, n. receptacle
Derbyniad, n. reception
Derbyniol, a. admissible
Derbynioldeb, n. acceptableness