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d.a.
D and C
D/D
D-day
D/F
D.H.
D.J.
D/L
D layer
D-notice
D/O
d’oh
D/P
D region
d.s.
D-sleep
d-tartaric acid
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D layer
D layer


noun 
Definition:
 
1. meteorology 
Same as  D region (sense 1)

2. lower layer of Earth's mantle: the lower layer of the Earth's mantle, from 720 km (450 mi) deep down to the boundary with the core
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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