| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Duhamelite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dukeite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dulcimer | No definition provided | Christopher Rauch | 2023.12.01 |
| Dumb | No definition provided | Christopher Rauch | 2023.12.01 |
| Dumbbell galaxies | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dumb-bells | No definition provided | Christopher Rauch | 2023.12.01 |
| Dummer's war | No definition provided | Christopher Rauch | 2023.12.01 |
| Dumontite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dumortierite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dumping appliances | No definition provided | Christopher Rauch | 2023.12.01 |
| Dump moraine | A mound or layer of moraine formed along the edge of a glacier by rock that falls off the ice; sometimes called a ground moraine. | GCW Glossary | 2023.03.27 |
| Dundasite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dundee (Ship) | No definition provided | Christopher Rauch | 2023.12.01 |
| dune | A dune is a hill of sand built by eolian processes. Dunes are subject to different forms and sizes based on their interaction with the wind. Most kinds of dune are longer on the windward side where th e sand is pushed up the dune, and a shorter slip face in the lee of the wind. The valley or trough between dunes is called a slack. A dune field is an area covered by extensive sand dunes. Large dune fields are known as ergs. | Ryan McGranaghan | 2023.04.16 |
| Dunes | No definition provided | Christopher Rauch | 2023.12.01 |
| Dunes, Battle of the, 1658 | No definition provided | Christopher Rauch | 2023.12.01 |
| Dungeons | No definition provided | Christopher Rauch | 2023.12.01 |
| Dunhamite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dunkards | No definition provided | Christopher Rauch | 2023.12.01 |
| Dunkers | No definition provided | Christopher Rauch | 2023.12.01 |