China 
Africa 
- Trilateral retinoblastoma
- Trilostane
- Trim24
- Trimalleolar fracture
- Trimazosin
- Trimebutine
- Trimer
- Trimesic acid
- Trimetazidine
- Trimethadione
- Trimethoprim
- Trimethoprim sulfamethoxazole
- Trimethylamine
- Trimethylamine N-oxide
- Trimethylaminuria
- Trimethylene carbonate
- Trimethylglycine
- Trimethylolpropane
- Trimethylsilane
- Trimethylsilyl chloride
- Trimethyltin chloride
- Trimetrexate
- Trimipramine
- Trimix
- Trimyristin
- Trinitrotoluene
- Trinucleotide repeat
- Trinucleotide repeat expansion
- Triol
- Triose phosphate isomerase
- Triosephosphate isomerase
- Trioxsalen
- Tripalmitin
- Triparanol
- Tripartite synapse
- Tripelennamine
- Tripeptide
- Tripeptidyl peptidase
- Tripeptidyl peptidase I
- Triphala
- Triphalangeal thumb
- Triphenylamine
- Triphenylene
- Triphenylethylene
- Triphosphatase
- Triple A syndrome
- Triple X syndrome
- Triple arthrodesis
- Triple helix
- Triple negative breast cancer
- Triple test
- Triple-A syndrome
- Triple-stranded DNA
- Triplegia
- Triplets
- Triploidy
- Tripod
- Tripod position
- Triprolidine
- Triptans
- Tripterygium wilfordii
- Triptolide
- Triptorelin
- Triquetrum bone
- Triradiate cartilage
- Tris
- Tris-buffered saline
- Trismus
- Trisomic rescue
- Trisomy
- Trisomy 13
- Trisomy 16
- Trisomy 18
- Trisomy 21
- Trisomy 22
- Trisomy 8
- Trisomy 9
- Trisomy X
- Tristimulus colorimeter
- Trisynaptic circuit
- Triterpenes
- Triterpenoids
- Trithorax-group proteins
- Triticeal cartilage
- Triticum aestivum
- Tritium
- Triton X-100
- Tritrichomonas
- Tritrichomonas foetus
- Trituration
- Trizol
- Trk receptor
- TrkC
- Trocar
- Trochanteric
- Trochanteric bursitis
- Trochlear
- Trochlear nerve
- Trochlear nucleus
- Trodusquemine
- Trofosfamide
- Troglitazone
- Trogocytosis
- Trolamine salicylate
- Troleandomycin
- Trolox
- Trombiculidae
- Tropane
- Tropane alkaloids
- Tropheryma whipplei
- Trophic factor
- Trophoblast
- Trophoblastic neoplasm
- Trophoblastic neoplasms
- Trophozoites
- Tropic acid
- Tropic hormone
- Tropical ataxic neuropathy
- Tropical diseases
- Tropical spastic paraparesis
- Tropical splenomegaly syndrome
- Tropical sprue
- Tropical ulcers
- Tropicamide
- Tropine
- Tropisetron
- Tropolone
- Tropomyosin
- Tropomyosin receptor kinase B
- Troponin
- Troponin C
- Troponin I
- Troponin T
- Troponin complex
- Trospium
- Trospium chloride
- Trotula
- Trough level
- Trovafloxacin
- Troxerutin
- True hermaphroditism
- True negative
- True positive rate
- Truenat
- Trueperella
- Truncal ataxia
- Truncated distribution
- Truncus arteriosus
- Trust
- Trypan blue