trimester
A period of three months or about three months; (financial): quarter.
One of the terms of an academic year in those learning institutions that divide their teaching in three roughly equal terms, each about three months long. Compare semester.

trimesters
plural of trimester

trination
In the Catholic Church, the offering up of the Holy Sacrifice of the Mass three times on the same day by the same celebrant.

trinitite
The glassy residue left on the desert floor after the Trinity nuclear bomb test of 1945 at Alamogordo, New Mexico, USA.
by extension, any melt glasses left by atomic bombs

trinitites
plural of trinitite

trinucleon
A bound state of three nucleons

trinucleons
plural of trinucleon

trion
A singlet state formed from three atoms of different colours

trions
plural of trion

triopolies
plural of triopoly

triopoly
A market situation in which three companies dominantly provide a particular product or service.

trioxymethylene
1,3,5-trioxane, a stable cyclic trimer of formaldehyde.

triperies
plural of tripery

tripery
A place where tripe is prepared or sold.

tripeshop
A shop selling tripe (meat product).

tripeshops
plural of tripeshop

triplexer
A multiplexer that multiplexes three ports onto one port.

triplexers
plural of triplexer

trisem
Synonym of trimester.

trispermum
A poultice made of the crushed seeds of cumin, bay, and smallage.

trithing
a riding (one of three ancient divisions of a county in England)

trithings
plural of trithing

tritoniid
Any sea slug in the family Tritoniidae.

tritoniids
plural of tritoniid

triviid
Any in the family Triviidae of sea snails.

triviids
plural of triviid

trivium
The lower division of the liberal arts in a medieval university; grammar, logic, and rhetoric.
The three anterior ambulacra of echinoderms, collectively.
Singular of trivia; anything of little importance.

triviums
plural of trivium

trocha
A line of fortifications, usually rough, constructed to prevent the passage of an enemy across a region.

trochas
plural of trocha

troglomorphism
The morphological adaptation to life in the constant darkness of a cave.

troglomorphisms
plural of troglomorphism

troglomorphy
Synonym of troglomorphism.

trolleyology
An area of philosophy dealing with the kind of moral dilemma typified by the trolley problem of whether to sacrifice one person to save others.

tronk
A prison.

tronks
plural of tronk

tropopause
The zone of transition between the troposphere and the stratosphere (approximately 13 kilometers). The tropopause normally occurs at an altitude of between 25,000 and 45,000 feet in polar and temperate zones. It occurs at 55,000 feet in the tropics.

tropopauses
plural of tropopause

trottoir
A paved path, for the use of pedestrians, located at the side of a road.

trottoire
Alternative form of trottoir.

trottoires
plural of trottoire

trottoirs
plural of trottoir

troublespot
A location of difficulties or hostilities; a hot spot; a flashpoint.

troublespots
plural of troublespot

truckdock
A loading dock for trucks.

truckyard
A yard where trucks are loaded and unloaded.

truckyards
plural of truckyard

trumeau
The pillar or center post supporting the lintel in the middle of a doorway or window opening, especially in a church.
A trumeau mirror.

trumeaus
plural of trumeau

trumeaux
plural of trumeau

trusteeism
A practice in certain parishes of the Catholic Church in the United States under which laypersons participate in the administration of ecclesiastical property.

tsarate
Alternative form of czarate.

tsarates
plural of tsarate

tsardom
The territory ruled by a tsar.
The role or status of tsar.

tsardoms
plural of tsardom

tsechu
Alternative form of tshechu.

tsechus
plural of tsechu

tselina
A "virgin land": an underdeveloped, scarcely populated, high-fertility region of land often covered with chernozem soil in Russia and Kazakhstan.

tselinas
plural of tselina

tseliny
plural of tselina

tsesarevich
Crown prince (heir apparent or presumptive) in the Russian Empire, from 1797 till 1917.

tsesareviches
plural of tsesarevich

tshechu
Any of the annual religious festivals held in each district or dzongkhag of Bhutan on the tenth day of a month of the lunar Tibetan calendar.

tshechus
plural of tshechu

tuberosphere
The area of soil surrounding, and influenced by, a plant tuber

tuberospheres
plural of tuberosphere

tuchunate
The territory governed by a tuchun.

tuchunates
plural of tuchunate

tukdam
An advanced state of meditation believed to be attained by some experienced meditators following their deaths.

tukul
A cone-shaped mud hut, usually with a thatched roof, found in eastern and northeastern Africa

tukuls
plural of tukul

tuladi
A large lake trout, Salvelinus namaycush, found mainly in Canada and northern areas of the US.

tuladis
plural of tuladi

tulou
A fortified Chinese rural dwelling made from earth, unique to the Hakka in the mountainous areas in southeastern Fujian.

tum
shortened form of tummy

tummock
A mound or hillock.

tums
plural of tum

tunket
Hell (intensifier in "what the hell" and similar phrases).

tunnelful
Enough to fill a tunnel.

tunnelfuls
plural of tunnelful

tunnelway
A tunnel.

tunnelways
plural of tunnelway

turbaries
plural of turbary

turbary
Peatland from which peat or turf may be cut for fuel; (countable) a piece of such land; a peat bog.
In full common of turbary: the right to cut peat or turf from peatland on a common or another person's land.
Material extracted from peatland; peat.

turbocharger
An inlet air compressor for an internal combustion engine (either Otto or Diesel cycle), powered from the exhaust air.

turbochargers
plural of turbocharger

turdis
A place to defecate, shaped like a police box; an outhouse; a portable toilet.

turdises
plural of turdis

turlet
Pronunciation spelling of toilet.

turlets
plural of turlet

turlough
A temporary lake in an area of limestone, filled by rising groundwater during the rainy winter season.

turloughs
plural of turlough

turpit
The ocean triggerfish, Canthidermis maculatus.

tussockland
A type of ecological region of New Zealand where grasses of the genus Chionochloa predominate.

tuya
Table mountain formed during subglacial volcanic eruptions, consisting primarily of a mound of pyroclastic palagonitic tuff, lava delta hyaloclastites, and pillow lavas erupted subaqueously in an englacial lake, capped by a resistant layer of subaerially-emplaced lava.

tuyas
plural of tuya

tweendom
The stage, state, or world of tweens; tweens collectively.

tweendoms
plural of tweendom

twelveplex
A building divided into twelve separate residences or commercial premises.

twelveplexes
plural of twelveplex

twigloo
A temporary circular shelter or structure built from thin branches.

twigloos
plural of twigloo

twitteration
A flutter; a state of anxiety or excitement.

twitterations
plural of twitteration

tychoplankton
Any benthic organism found amongst plankton because of sea currents etc.

tychoplanktons
plural of tychoplankton

tyekhana
Alternative form of tykhana.

tyekhanas
plural of tyekhana

tykhana
An underground chamber in which to keep cool during the heat of the day.

tykhanas
plural of tykhana

tzardom
Alternative spelling of tsardom.

tzardoms
plural of tzardom

ubac
The shady side of a mountain; in the northern hemisphere, especially a north-facing slope.

ubacs
plural of ubac

uezd
Alternative form of uyezd.

uezds
plural of uezd

uezdy
plural of uezd

ufocal
A focus of UFO activity.

ujamaa
A socialist ideology of cooperation and collective advancement that formed the basis of socioeconomic policies in Tanzania in the 1960s.
A village built according to this ideology, with central homes and school surrounded by communal farmland.

ujamaas
plural of ujamaa

ulpan
An Israeli school where the Hebrew language is taught to new immigrants.

ulpanim
plural of ulpan

ulpans
plural of ulpan