dien bien phu
- n the French military base fell after a siege by Vietnam troops that lasted 56 days; ended the involvement of France in Indochina in 1954
diencephalon
- n the posterior division of the forebrain; connects the cerebral hemispheres with the mesencephalon
dieresis
- n a diacritical mark (two dots) placed over a vowel in German to indicate a change in sound