Prefix indicating a chemical compound to be dextrorotatory; should be avoided when (+) or (−) could be used. Cf.:l-.
Prefix indicating that a chemical compound is sterically related to d-glyceraldehyde, the basis of stereochemical nomenclature. Cf.:l-.
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d- .dē, 'dē prefix
1) dextrorotatory usu. printed in italic <d-tartaric acid>
2) having a similar configuration at a selected carbon atom to the configuration of dextrorotatory glyceraldehyde usu. printed as a small capital <D-fructose>

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a chemical prefix (small capital D) that specifies the relative configuration of an enantiomer, the mirror image configuration being specified as L-. Carbohydrates are designated as D or L depending on their configuration at the asymmetric carbon atom most distant from the carbonyl functional group; those with the same configuration as the D-glyceraldehyde (the arbitrarily chosen standard) are in the D (or Dg) configurational family. Amino acids are designated according to their configuration at the asymmetric carbon atom closest to the carbonyl group; D-serine is the standard and similarly configured amino acids are designated D or Ds. All of the α-amino acids occurring in proteins have the L configuration; a few D-amino acids occur in short peptides produced by bacteria. The symbols R and S, indicating absolute configuration, are preferable.

Medical dictionary. 2011.

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