| Term | Definition | Contributor | Modified |
|---|---|---|---|
| Delta Scuti variable stars | A member of a class of pulsating stars with periods less than 0.3 days, spectral types A or F, and visual light amplitudes in the range from a few thousands of a magnitude to about 0.8 mag. On the H-R diagram, δ Scuti stars form a group which lies in an instability strip which includes the classical Cepheids at its brightest end and the pulsating white dwarfs at its faintest limit. These stars can show very complex light variations since, while some of them are pulsating in one radial mode only, others may be pulsating simultaneously in several radial and non-radial modes. | Ryan McGranaghan | 2023.04.16 |
| Delta sunspots | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Delta sunspots | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Deluge | No definition provided | Christopher Rauch | 2023.12.01 |
| Delusions | No definition provided | Christopher Rauch | 2023.12.01 |
| Delvauxite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| demand | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Demand and supply | No definition provided | Christopher Rauch | 2023.12.01 |
| Demand estimation | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Demantoid | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Demarcation line of Alexander vi | No definition provided | Christopher Rauch | 2023.12.01 |
| Demarcation line of Alexander VI | No definition provided | Christopher Rauch | 2023.12.01 |
| Demartinite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Dementia | No definition provided | Christopher Rauch | 2023.12.01 |
| demersal zone | The demersal zone is the part of the sea or ocean (or deep lake) comprising the water column that is near to (and is significantly affected by) the seabed and the benthos. The demersal zone is just ab ove the benthic zone and forms a layer of the larger profundal zone. | Ryan McGranaghan | 2023.04.16 |
| Demesmaekerite | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Demicheleite (Br) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Demicheleite (Cl) | No definition provided | Ryan McGranaghan | 2023.04.16 |
| Demilunes of Heidenhain | No definition provided | Christopher Rauch | 2023.12.01 |
| Democracy | No definition provided | Christopher Rauch | 2023.12.01 |