Deoxyribonucleic acid (DNA)

Deployable systems

Depositional systems and environments

Depression

Dermaptera

Dermatitis

Dermoptera

Derrick

Derris

Descriptive geometry

Desert

Desert dust-storm microbiology

Desertification

Desiccant

Design and build

Design standards

Designing for and mitigating earthquakes

Desmodorida

Desmoscolecida

Desmostylia

Desmothoracida

Desorption

Desorption electrospray ionization mass spectrometry

Destructive distillation

Detection of respiratory viruses

Detergent

Determinant

Determinism

Deuterium

Deuteron

Deuterostomia

Development of drought-tolerant crops through breeding and biotechnology

Developmental biology

Developmental genetics

Developmental psychology

Developmental timing and oscillating gene expression

Devonian

Devonian missing link

Dew

Dew point

Dewar flask

Dewaxing of petroleum

Dextran

Diabetes

Diadematoida

Diagenesis

Dialectical behavior therapy

Diamagnetism

Diamond

Diamond thin films

Diapensiales

Diapir

Diapsida

Diarrhea

Diastem

Diazotization

Dichroism

Dichroism (biology)

Dicotyledons

Dicranales

Dicyemida (Rhombozoa)

Dicynodontia

Didymelales

Dielectric heating

Dielectric materials

Dielectric measurements

Diels-Alder reaction

Diesel cycle

Diesel engine

Diesel fuel

Diesel particulate filters

Dietary fructose and the physiology of body weight regulation

Difference equation

Differential

Differential amplifier

Differential duplicate gene retention

Differential equation

Differential geometry

Differential transformer

Differentiation

Diffraction

Diffraction grating

Diffuser

Diffusion

Digenea

Digestion

Digestive system

Digital cinema

Digital control

Digital counter

Digital elevation models

Digital evidence

Digital filter

Digital geological mapping

Digital image processing

Digital imaging (forensics)

Digital object identifier system

Digital photography

Digital presses

Digital proofing