- tricktrack
- tricky
- triclad
- triclinic
- triclinium
- triclosan
- tricolette
- tricolor
- tricolor camera
- tricolored heron
- tricolour
- tricorn
- tricornered
- tricostate
- tricot
- tricotine
- tricotyledonous
- tricresol
- tricrotic
- trictrac
- tricuspid
- tricuspid valve
- tricuspidate
- tricyanic acid
- tricycle
- tricyclic
- trid.
- tridactyl
- tridarn cupboard
- trident
- tridentate
- tridimensional
- triduum
- tridymite
- triecious
- tried
- tried and true
- tried-and-true
- triella
- triene
- triennial
- triennium
- triens
- trier
- trierarch
- trierarchy
- tries
- triethyl
- triethyl orthoformate
- triethylamine
- trifacial
- trifacial neuralgia
- trife
- trifecta
- triffid
- trifid
- trifid foot
- trifle
- trifling
- trifluoperazine
- trifluoride
- trifluorochloromethane
- trifluralin
- trifocal
- trifold
- trifoliate
- trifoliate orange
- trifoliolate
- trifolium
- triforium
- triform
- trifunctional
- trifurcate
- trig
- trig function
- trig point
- trig.
- triga
- trigamous
- trigamy
- trigeminal
- trigeminal nerve
- trigeminal neuralgia
- trigeneration
- trigger
- trigger finger
- trigger happy
- trigger mechanism
- trigger plant
- trigger warning
- trigger word
- trigger-happy
- triggered
- triggerfish
- triggerman
- triglyceride
- triglyph
- trigo
- trigon
- trigon.
- trigonal
- trigonal trisoctahedron
- trigone
- trigonometric equation
- trigonometric function
- trigonometric series
- trigonometry
- trigonous
- trigonum
- trigram
- trigraph
- trihalomethane
- trihedral
- trihedron
- trihydrate
- trihydric
- trihydroxy
- triiodomethane
- triiodothyronine
- trijet
- trijugate
- trike
- trilateral
- trilateralism
- trilateration
- trilby
- trilemma
- trilinear
- trilingual
- triliteral
- triliteralism
- trilithon
- trill
- trillion
- trillionaire
- trillium
- trilobate
- trilobed
- trilobite
- trilocular
- trilogy
- trim
- trim die
- trim one's sails
- trim rail
- trim size
- trim tab
- trimaran
- trime
- trimer
- trimerous
- trimester
- trimetallic
- trimeter
- trimethadione
- trimethoprim
- trimethylene
- trimethylglycine
- trimetric
- trimetric projection
- trimetrogon
- trimmer
- trimmer arch
- trimming
- trimodal
- trimolecular
- trimonthly
- trimorph
- trimorphism
- trimotor
- trinal
- trinary
- trination
- trindle
- trine
- trine immersion
- tringle
- trinitro-
- trinitrobenzene
- trinitrocresol
- trinitroglycerin
- trinitroglycerine
- trinitrophenol
- trinitrophenylmethylnitramine
- trinitrotoluene
- trinity
- trinket
- trinketer
- trinketry
- trinocular
- trinodal
- trinomial
- trinucleotide
- trio
- trio sonata
- triode
- trioecious
- triol
- triolein
- triolet
- triose
- trioxide
- trip
- trip line
- trip out
- trip switch
- trip the light fantastic
- trip up
- trip-hop
- tripalmitin
- triparted
- tripartite
- tripartite and fretty
- tripartition
- tripe
- tripe-de-roche
- tripedal
- tripelennamine
- tripersonal
- tripersonality
- tripetalous
- triphammer
- triphasic
- triphenylmethane
- triphenylmethane dye
- triphibian
- triphibious
- triphosphate
- triphosphoric acid
- triphthong
- triphylite
- triphyllous
- tripinnate
- triplane
- triple
- triple A
- triple alpha process
- triple bogey
- triple bond
- triple counterpoint
- triple cream
- triple crown
- triple dresser
- triple expansion engine
- triple figure
- triple fugue
- triple integral
- triple jump
- triple play
- triple point
- triple rhythm
- triple sec
- triple threat
- triple time
- triple voile
- triple witching hour
- triple-decker
- triple-digit
- triple-double
- triple-expansion
- triple-header
- triple-nerved
- triple-space
- triple-tongue
- triplet
- tripletail
- tripleton
- triplex
- triplicate
- triplicity
- triplite
- triploblastic
- triploid
- triply
- tripmeter
- tripod
- tripodal
- tripodic
- tripody
- tripoli
- tripos
- tripotassium phosphate
- trippant
- tripper
- trippet
- tripping
- tripping line
- trippy
- triptane
- tripteral
- tripterous
- triptych
- triptyque
- tripwire
- triquetra
- triquetrous
- triradiate
- triradius
- trireme
- trisaccharide