d- \(|)dē\prefix Etymology: International Scientific Vocabulary, from dextr- 1.: dextrorotatory — usually printed in italic < d-tartaric acid > — compare dextr- 2 2.: having a similar configuration at a selected asymmetric carbon atom in an optically active molecule to the configuration of dextrorotatory glyceraldehyde — usually printed as a small capital < d-fructose >