- trilogy
- trim
- Trim
- trimaran
- Trimble
- trim die
- trime
- trimer
- trimerous
- trimester
- trimetallic
- trimeter
- trimethadione
- trimethoprim
- trimethylene
- trimethylglycine
- trimetric
- trimetric projection
- trimetrogon
- trimmer
- trimmer arch
- trimming
- trimodal
- trimolecular
- trim one's sails
- trimonthly
- trimorph
- trimorphism
- trimotor
- trim rail
- trim size
- trim tab
- Trimurti
- Trinacria
- Trinacrian
- trinal
- trinary
- trination
- Tri-Nations Championship
- Trinbagonian
- Trincomalee
- trindle
- trine
- trine immersion
- tringle
- Trini
- Trinidad
- Trinidad and Tobago
- Trinil man
- Trinitarian
- Trinitarianism
- trinitro-
- trinitrobenzene
- trinitrocresol
- trinitroglycerin
- trinitroglycerine
- trinitrophenol
- trinitrophenylmethylnitramine
- trinitrotoluene
- trinity
- Trinity
- Trinity Brethren
- Trinity House
- Trinity Sunday
- Trinity term
- Trinitytide
- trinket
- trinketer
- trinketry
- trinocular
- trinodal
- trinomial
- trinucleotide
- trio
- triode
- trioecious
- triol
- triolein
- triolet
- triose
- trio sonata
- trioxide
- trip
- tripalmitin
- triparted
- tripartite
- tripartite and fretty
- tripartition
- tripe
- tripedal
- tripe-de-roche
- tripelennamine
- tripersonal
- tripersonality
- tripetalous
- triphammer
- triphasic
- triphenylmethane
- triphenylmethane dye
- triphibian
- triphibious
- trip-hop
- triphosphate
- triphosphoric acid
- triphthong
- triphylite
- triphyllous
- tripinnate
- Tripitaka
- triplane
- triple
- triple A
- Triple Alliance
- triple alpha process
- triple bogey
- triple bond
- triple counterpoint
- triple cream
- triple crown
- Triple Crown
- triple-decker
- triple-digit
- triple-double
- triple dresser
- Triple Entente
- triple-expansion
- triple expansion engine
- triple figure
- triple fugue
- triple-header
- triple integral
- triple jump
- triple-nerved
- triple play
- triple point
- triple rhythm
- triple sec
- triple-space
- triplet
- tripletail
- triple threat
- triple time
- tripleton
- triple-tongue
- triple voile
- triple witching hour
- triplex
- Triplex
- triplicate
- triplicity
- trip line
- triplite
- triploblastic
- triploid
- triply
- tripmeter
- tripod
- tripodal
- tripodic
- tripody
- tripoli
- Tripoli
- Tripolitania
- Tripolitanian
- Tripolitan War
- tripos
- tripotassium phosphate
- trip out
- trippant
- tripper
- trippet
- tripping
- tripping line
- trippy
- trip switch
- triptane
- tripteral
- tripterous
- trip the light fantastic
- Triptolemus
- triptych
- triptyque
- trip up
- Tripura
- tripwire
- triquetra
- triquetrous
- triradiate
- triradius
- Triratna
- trireme
- trisaccharide
- trisect
- trisepalous
- triseptate
- triserial
- trishaw
- triskaidekaphobia
- triskelion
- Trismegistus
- trismus
- trisoctahedron
- trisodium
- trisodium phosphate
- trisome
- trisomic
- trisomy
- trisomy 13
- trisomy 21
- trispast
- trispermous
- Tristan
- Tristan and Iseult
- Tristan da Cunha
- Tristan und Isolde
- tristate
- tri-state
- triste
- tristearin
- tristeza
- tristful
- tristich
- tristichous
- tristimulus values
- Tristram
- Tristram Shandy
- tristylous
- trisubstituted
- trisulfide
- trisulphide
- trisyllable
- trit.
- tritagonist
- tritanopia
- trite
- tritheism
- trithing
- tritiate
- triticale
- triticum
- tri-tip
- tritium
- tritoma
- triton
- Triton
- tritone
- tritonia
- Tritonis
- triturable
- triturate
- trituration
- triumph
- triumphal
- triumphal arch
- triumphalism
- triumphant
- triumphantly
- triumvir
- triumvirate
- triune
- triunitarian
- Triunitarian
- triunity
- trivalent
- trivalve
- Trivandrum
- trivet
- trivia
- Trivia
- trivial
- trivialism
- triviality
- trivialize
- trivial name
- trivium
- triweekly
- Trixie
- triˈchromaˌtism
- TRM
- tRNA
- t-RNA
- TRO
- Troad
- Troas
- troat
- trobar clus
- Trobriand Islander
- Trobriand Islands
- trocar
- troch.
- trochaic
- trochal
- trochanter
- troche
- trochee
- trochelminth
- trochilus
- trochlea
- trochlear
- trochlear nerve
