Derwin, a. oaken, made of oak
Derwydd, n. a druid
Derwyddol, a. druidic, druidical
Derwyddoni, n. druidism
Deryw, v. it is done
Dês, n. system, order, rule
Desgyn, to ascend, to mount in rhetoric
Desgyneb, n. a climax
Desgyniad, n. ascension
Desgynol, a. ascending