- three-point turn
- three-pointer
- three-quarter
- three-quarter armor
- three-quarter binding
- three-quarter nelson
- three-quarter time
- three-quarter turn stair
- three-ring circus
- three-speed
- three-spot
- three-square
- three-star
- three-strikes law
- three-suiter
- three-thorned acacia
- three-toed sloth
- three-toed woodpecker
- three-valued
- three-wattled bellbird
- three-way
- three-way bulb
- three-wheeler
- threefold
- threep
- threepence
- threepenny
- threepenny bit
- threequel
- threes and eights
- threescore
- threesome
- threespine stickleback
- thremmatology
- threnode
- threnody
- threonine
- thresh
- thresh out
- thresher
- threshing machine
- threshold
- threshold agreement
- threw
- thrice
- thrift
- thrift store
- thrifting
- thriftless
- thrifty
- thrill
- thrill to pieces
- thrill-seeker
- thrilled
- thriller
- thrilling
- thrippence
- thrips
- thrive
- thriving
- thro
- thro'
- throat
- throat microphone
- throat seizing
- throated
- throatlash
- throatlatch
- throaty
- throb
- throbbing
- throe
- throes
- thrombectomy
- thrombin
- thrombo-
- thromboclasis
- thrombocyte
- thrombocytopenia
- thromboembolism
- thrombogen
- thrombokinase
- thrombolysis
- thrombolytic
- thrombophlebitis
- thromboplastic
- thromboplastin
- thrombopoietin
- thrombose
- thrombosis
- thromboxane
- thrombus
- throne
- throne room
- throng
- thronner
- thronos
- throstle
- throttle
- throttle lever
- throttle valve
- throttle-body injection
- throttleable
- throttlehold
- through
- through a glass darkly
- through and through
- through bass
- through bridge
- through one's hat
- through one's head
- through one's mind
- through rose-colored glasses
- through stone
- through street
- through the mill
- through the motions
- through thick and thin
- through-composed
- through-line
- through-other
- through-the-lens meter
- throughly
- throughout
- throughput
- throughway
- throuple
- throve
- throw
- throw a curve
- throw a fit
- throw a monkey wrench into
- throw a party
- throw a punch
- throw about
- throw away
- throw back
- throw caution to the winds
- throw cold water on
- throw down
- throw down the gauntlet
- throw dust in someone's eyes
- throw for a loop
- throw good money after bad
- throw in
- throw in one's hand
- throw in one's lot with
- throw in someone's face
- throw in the sponge
- throw in the towel
- throw light on
- throw off
- throw off balance
- throw off the track
- throw one's hat in the ring
- throw one's weight around
- throw oneself at
- throw oneself into
- throw open
- throw out
- throw out the baby with the bath water
- throw over
- throw pillow
- throw rug
- throw someone
- throw the book at
- throw the book at someone
- throw to the wolves
- throw together
- throw up
- throw up one's hands
- throw up to
- throw weight
- throw-weight
- throwaway
- throwback
- throwed
- thrower
- throwing stick
- thrown
- thrown silk
- thrown to the lions
- throwster
- thru
- thrum
- thrum-eyed
- thrummy
- thrump
- thrupenny bit
- thruppence
- thrush
- thrust
- thrust augmentation
- thrust bearing
- thrust fault
- thrust stage
- thruster
- thrusting
- thrutch
- thruway
- thrymsa
- thud
- thug
- thuggee
- thuja
- thulia
- thulium
- thumb
- thumb a ride
- thumb drive
- thumb glass
- thumb index
- thumb knot
- thumb one's nose
- thumb piano
- thumb-index
- thumb-sucker
- thumber
- thumbhole
- thumbkin
- thumbnail
- thumbnail sketch
- thumbnut
- thumbpiece
- thumbprint
- thumbs up
- thumbs-down
- thumbs-up
- thumbscrew
- thumbstall
- thumbtack
- thump
- thumping
- thunbergia
- thunder
- thunder egg
- thunder mug
- thunder sheet
- thunderation
- thunderbird
- thunderbolt
- thunderbox
- thunderclap
- thundercloud
- thunderhead
- thundering
- thunderous
- thunderpeal
- thundershower
- thundersquall
- thunderstick
- thunderstone
- thunderstorm
- thunderstrike
- thunderstroke
- thunderstruck
- thundery
- thunk
- thurible
- thurifer
- thurl
- thurm
- thus
- thus far
- thusly
- thuya
- thwack
- thwaite
- thwart
- thx
- thy
- thylacine
- thylakoid
- thyme
- thymectomy
- thymelaeaceous
- thymic
- thymidine
- thymidylic acid
- thymine
- thymocyte
- thymol
- thymosin
- thymus
- thymus gland
- thymy
- thyratron
- thyristor
- thyro-
- thyrocalcitonin
- thyroid
- thyroid gland
- thyroid hormone
- thyroid stimulating hormone
- thyroid-stimulating hormone
- thyroidectomy
- thyroiditis
- thyrosis
- thyrotome
- thyrotomy