China 
Africa 
- Dew point
- Dewatering
- Dexamethasone
- Dexron
- Dextral
- Dextran
- Dextran 1
- Dextrin
- Dextrose equivalent
- Diabase
- Diabetes
- Diabetic nephropathy
- Diabetic retinopathy
- Diacetyl
- Diacetylene
- Diachronous
- Diacylglycerol
- Diadinoxanthin
- Diafiltration
- Diagenesis
- Diagnosis
- Diagnosis codes
- Diagnosis-related group
- Diagnostic odds ratio
- Diagonal
- Diagonal matrix
- Diagonal relationship
- Diagonalizable
- Diagonalizable matrix
- Diagonally dominant
- Diagrams
- Diagrid
- Dial
- Dial indicators
- Dialing
- Diallyl disulfide
- Dialog manager
- Dialogflow
- Dialysis
- Diamagnetic
- Diamagnetic ring current
- Diamagnetism
- Diamantane
- Diameter
- Diameter at breast height
- Diamictite
- Diamines
- Diaminopimelic acid
- Diammonium phosphate
- Diamond
- Diamond blades
- Diamond cubic
- Diamond drilling
- Diamond grinding
- Diamond interchange
- Diamond knives
- Diamond simulants
- Diamond tools
- Diamond turning
- DiamondTouch
- Diamondoids
- Dianion
- Diapause
- Diaper rash
- Diapers
- Diaphragm
- Diaphragm compressor
- Diaphragm pumps
- Diaphragm valves
- Diaphragms
- Diaphysis
- Diapirs
- Diarrhea
- Diarrhetic shellfish poisoning
- Diarylethene
- Diarylheptanoids
- Diaspore
- Diastase
- Diastasis
- Diastereomers
- Diastolic dysfunction
- Diastolic function
- Diastrophism
- Diathermy
- Diatomaceous earth
- Diatomic
- Diatomic molecules
- Diatremes
- Diazinon
- Diazo
- Diazodinitrophenol
- Diazomethane
- Diazonium salts
- Diazotrophs
- Dibal
- Dibenzofuran
- Dibenzothiophene
- Dibenzylideneacetone
- Diborane
- Dibromochloromethane
- Dibromomethane
- Dibutyl ether
- Dibutyl phthalate
- Dibutyl sebacate
- Dibutyltin dilaurate
- Dicalcium phosphate
- Dicamba
- Dicarbonyl
- Dicarboxylic acids
- Dicentric chromosome
- Dichloramine
- Dichloroacetic acid
- Dichloroaniline
- Dichlorobenzene
- Dichlorocarbene
- Dichlorodifluoromethane
- Dichlorodiphenyldichloroethylene
- Dichloroethene
- Dichloroethylene
- Dichlorofluoromethane
- Dichloromethane
- Dichloromethyl methyl ether
- Dichlorophenol
- Dichlorophenolindophenol
- Dichlorvos
- Dichroic
- Dichroic filters
- Dichroic prism
- Dichroism
- Dicing saw
- Dicofol
- Dicoumarol
- Dictionary attack
- Dictionary learning
- Dicumyl peroxide
- Dicyandiamide
- Dicyclohexyl
- Dicyclohexylamine
- Dicyclohexylcarbodiimide
- Dicyclohexylurea
- Dicyclopentadiene
- Didanosine
- Dideoxynucleotides
- Die
- Die casting
- Die forming
- Die swell
- Die-cut
- Dieback
- Dieldrin