diptych
- n a painting or carving (especially an altarpiece) on two panels (usually hinged like a book)
dipus
- n type genus of the Dipodidae; typical jerboas having three toes on each hind foot
dipylon gate
- n a gateway to the west of ancient Athens near which a distinctive style of pottery has been found
dirac
- n English theoretical physicist who applied relativity theory to quantum mechanics and predicted the existence of antimatter and the positron (1902-1984)