- Total internal reflection fluorescence microscope
- Total iron binding capacity
- Total iron-binding capacity
- Total knee arthroplasty
- Total lung capacity
- Total mesorectal excision
- Total peripheral resistance
- Total synthesis
- Totipotent
- Totipotent stem cells
- Touch receptors
- Tourette syndrome
- Tourette's syndrome
- Tourniquet
- Tourniquet test
- Tower of London test
- Townes-Brocks syndrome
- Toxalbumin
- Toxaphene
- Toxemia
- Toxic
- Toxic alcohol
- Toxic amblyopia
- Toxic encephalopathy
- Toxic epidermal necrolysis
- Toxic equivalency factor
- Toxic gas
- Toxic granulation
- Toxic injury
- Toxic leukoencephalopathy
- Toxic masculinity
- Toxic megacolon
- Toxic metals
- Toxic multinodular goitre
- Toxic oil syndrome
- Toxic shock syndrome
- Toxic waste
- Toxicant
- Toxicity
- Toxicity class
- Toxicity test
- Toxicity testing
- Toxicodendron
- Toxicodynamics
- Toxicogenomics
- Toxicokinetics
- Toxicology
- Toxicophore
- Toxidrome
- Toxification
- Toxins
- Toxocara canis
- Toxocara cati
- Toxocariasis
- Toxoflavin
- Toxoids
- Toxoplasma gondii
- Toxoplasmosis
- Trabectedin
- Trabectome
- Trabecular
- Trabecular bone
- Trabecular bone score
- Trabecular meshwork
- Trabeculectomy
- Trabeculoplasty
- Trace amine-associated receptors
- Trace amines
- Trace elements
- Trace metals
- Traceability
- Tracheal
- Tracheal agenesis
- Tracheal cytotoxin
- Tracheal deviation
- Tracheal intubation
- Tracheal rings
- Tracheal stenosis
- Tracheal tube
- Trachealis muscle
- Tracheitis
- Tracheobronchial injury
- Tracheobronchial lymph nodes
- Tracheobronchitis
- Tracheobronchomalacia
- Tracheobronchomegaly
- Tracheobronchopathia osteochondroplastica
- Tracheoesophageal fistula
- Tracheomalacia
- Tracheostomy
- Tracheostomy tube
- Tracheotomy
- Trachoma
- Traction alopecia
- Traction splint
- Tractography
- Traditional Chinese medicine
- Traditional Tibetan medicine
- Traditional medicine
- Traditional serrated adenoma
- Tragus
- Trail Making Test
- Trained immunity
- Trait anxiety
- Tralokinumab
- Tramadol
- Trametes versicolor
- Trance
- Tranexamic acid
- Tranilast
- Tranquilizers
- Trans fatty acids
- Trans isomer
- Trans resveratrol
- Trans splicing
- Trans-acting
- Transabdominal ultrasound
- Transactivation
- Transactivation domain
- Transactive memory
- Transamidation
- Transaminases
- Transamination
- Transanal hemorrhoidal dearterialization
- Transanal irrigation
- Transcatheter arterial chemoembolization
- Transcellular
- Transcellular fluid
- Transcellular transport
- Transcortical motor aphasia
- Transcortical sensory aphasia
- Transcortin
- Transcranial Doppler
- Transcranial doppler
- Transcription
- Transcription activator-like effector
- Transcription bubble
- Transcription factor II A
- Transcription factor II H
- Transcription factor Sp1
- Transcription factors
- Transcription initiation
- Transcription mediated amplification
- Transcription regulation
- Transcription termination
- Transcription-translation coupling
- Transcriptional activator
- Transcriptional noise
- Transcriptome
- Transcriptomics