China 
Africa 
- Decellularization
- Decene
- Decenoic acid
- Deception
- Dechlorination
- Decidua
- Decidual cells
- Decidualization
- Deciduous teeth
- Deciles
- Decimal reduction time
- Decision
- Decision aids
- Decision making
- Decision theory
- Decision-making process
- Decitabine
- Declaration of Geneva
- Declaration of Helsinki
- Declarative knowledge
- Declarative memory
- Decoctions
- Decolonization
- Decompensated heart failure
- Decompensation
- Decomposers
- Decompression
- Decompression illness
- Decompression sickness
- Decompression surgery
- Decompressive craniectomy
- Deconditioning
- Decongestants
- Decontamination
- Decorin
- Decortication
- Decoy cells
- Decoy receptors
- Decreased appetite
- Dectin 1
- Decubitus
- Decussation
- Dedifferentiation
- Deep
- Deep brain stimulation
- Deep brain stimulators
- Deep branch
- Deep branch of the radial nerve
- Deep breathing
- Deep cerebellar nuclei
- Deep cerebral veins
- Deep cervical artery
- Deep cervical fascia
- Deep cervical lymph nodes
- Deep dorsal vein of the penis
- Deep fascia
- Deep femoral artery
- Deep femoral vein
- Deep fibular nerve
- Deep hypothermic circulatory arrest
- Deep inguinal lymph nodes
- Deep inguinal ring
- Deep inspiration breath-hold
- Deep neural networks
- Deep palmar arch
- Deep petrosal nerve
- Deep plantar artery
- Deep sequencing
- Deep sleep therapy
- Deep sulcus sign
- Deep temporal arteries
- Deep transverse metacarpal ligament
- Deep vein
- Deep-dose equivalent
- Deer
- Default mode network
- Defecation
- Defecography
- Defeminization
- Defence mechanisms
- Defense in depth
- Defense mechanisms
- Defensins
- Defensive medicine
- Defensiveness
- Deferasirox
- Deferiprone
- Deferoxamine
- Deferred imitation
- Defibrillation
- Defibrillation threshold
- Defibrillator
- Defibrotide
- Deficiency
- Deficiency anemias
- Defined daily dose
- Deflagration
- Deflazacort
- Defoamer
- Defoliants
- Deformation
- Degarelix
- Degeneracy
- Degeneration
- Degenerative disc disease
- Degenerative diseases
- Degenerative myopia
- Deglutition
- Degos disease
- Degradation
- Degranulation
- Degree of polymerization
- Degrees of freedom problem
- Dehalogenation
- Dehumanization
- Dehydration
- Dehydroascorbic acid
- Dehydrocholic acid
- Dehydroemetine
- Dehydroepiandrosterone
- Dehydroepiandrosterone sulfate
- Dehydrogenase
- Dehydrogenases
- Deindividuation
- Deinococcus
- Deinococcus radiodurans
- Deinstitutionalisation
- Deinstitutionalization
- Deiodinase
- Deionization
- Deionized water
- Deiters' cells
- Deja vu
- Dejerine-Roussy Syndrome
- Dejerine-Roussy syndrome
- Dejerine-Sottas disease
- Delafloxacin
- Delamanid
- Delavirdine
- Delayed ejaculation
- Delayed graft function
- Delayed gratification
- Delayed grief
- Delayed hemolytic transfusion reaction
- Delayed hypersensitivity
- Delayed implantation
- Delayed milestone
- Delayed pressure urticaria
- Delayed puberty
- Delayed sleep phase disorder