| NOUN | location | D region, D-layer | the lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves |
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| Meaning | The lowest region of the ionosphere (35 to 50 miles up) that reflects low-frequency radio waves. | |
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| Synonym | D-layer | |
| Instance of | region, part | The extended spatial location of something |
| Part of | ionosphere | The outer region of the Earth's atmosphere |
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