1. Of or relating to or involving spectroscopy
   - spectroscopic

See also: spectroscopy

• order Dermoptera
• order Diapensiales
• order Dicranales
• order Dictyoptera
• order Dinocerata
• order Dinoflagellata
• order Dinornithiformes
• order Diptera
• order Discocephali
• order Ebenales
• order Edentata
• order Embiodea
• order Embioptera
• order Endomycetales
• order Entomophthorales
• order Ephemerida
• order Ephemeroptera
• order Equisetales
• order Ericales
• order Erysiphales
• order Eubacteriales
• order Eubryales
• order Euphausiacea
• order Eurotiales
• order Eurypterida