| | - D region
- lowest ionospheric region, at altitudes of about 70 to 90 km (40 to 55 miles). The D region differs from the other ionospheric regions (denoted E and F) in that its free electrons almost totally disappear during the night because ...
- d'Alembert's principle
- alternative form of Newton's second law of motion, stated by the 18th-century French polymath Jean le Rond d'Alembert. In effect, the principle reduces a problem in dynamics to a problem in statics. The second law states that the force F ...
- d'Amboise, Jacques
- American dancer and choreographer of the New York City Ballet (1949-84), admired for his energetic, virile interpretations of both character and classical roles.
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