- Dawn simulation
- Day hospital
- Daytime wetting
- Db db mouse
- DbSNP
- De Barsy Syndrome
- De Barsy syndrome
- De Musset's sign
- De Quervain's thyroiditis
- De novo mutations
- Deacetylation
- Deacylation
- Dead end filtration
- Dead space
- Dead tissue
- Deadlifts
- Deae sepharose
- Deae-sepharose
- Deaf community
- Deaf hearing
- Deafblindness
- Deafferentation
- Deafferentation pain
- Deafness
- Dealkylation
- Deaminase
- Deamination
- Deanol
- Death
- Death anxiety
- Death certificate
- Death domain
- Death drive
- Death effector domain
- Death receptor
- Death receptor 5
- Death-inducing signaling complex
- Debaryomyces hansenii
- Debridement
- Debriefing
- Debrisoquine
- Debulking
- Debye length
- Decaborane
- Decaffeination
- Decalcification
- Decalin
- Decamethonium
- Decamethylcyclopentasiloxane
- Decanal
- Decanoic acid
- Decarboxylase
- Decarboxylase inhibitor
- Decatastrophizing
- Decathexis
- Decay accelerating factor
- Decay scheme
- Decay series
- Decay-accelerating factor
- Decellularization
- Decene
- Decenoic acid
- Deception
- Dechlorination
- Decidua
- Decidual cells
- Decidualization
- Deciduous teeth
- Deciles
- Decimal reduction time
- Decision
- 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 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 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