D-layer

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  D-layer \D-layer\ n.
     the lowest region of the ionosphere (35 to 50 miles up) that
     reflects low-frequency radio waves.
  
     Syn: D region.
          [WordNet 1.5]



From WordNet (r) 2.0 [wn]:

  D-layer
       n : the lowest region of the ionosphere (35 to 50 miles up) that
           reflects low-frequency radio waves [syn: {D region}]