Derdri, n. obduracy
Dere, v. come thou
Deriad, n. a frowardly acting
Deriaw, v. to act frowardly
Derlin, n. the heart of oak
Derlwyn, n. an oak grove
Derllydd, a. poured, effused
Derllyddiad, n. depletion
Derllyddu, v. to pour out
Dernyn, n. a piece, a patch