12-letter words containing p, o, i, r
- trophobiotic — involving, belonging or relating to trophobiosis
- trophotactic — of or relating to trophotaxis
- trophotropic — of or relating to trophotropism
- trophy child — anything taken in war, hunting, competition, etc., especially when preserved as a memento; spoil, prize, or award.
- tropicalised — to make tropical, as in character or appearance.
- tropicalized — to make tropical, as in character or appearance.
- tropophilous — adapted to a climate characterized by marked environmental changes.
- trouser clip — a clip that is worn around the bottom of a trouser leg to stop the material getting caught in the chain of a bicycle
- trunk piston — a piston with a long skirt to take the side thrust, as in an automobile engine.
- trypanocidal — (of a drug, agent, activity, etc) effective in killing trypanosomes
- tutor period — (in British secondary schools) a school period for which a tutor group comes together with their tutor
- twin paradox — a phenomenon predicted by relativity. One of a pair of identical twins is supposed to live normally in an inertial system whilst the other is accelerated to a high speed in a spaceship, travels for a long time, and finally returns to rest beside his twin. The travelled twin will be found to be younger than his brother
- type i error — the error made in the statistical testing of a hypothesis by rejecting the null hypothesis when it is actually true.
- typhoid mary — Mary ("Typhoid Mary") 1869?–1938, U.S. cook, born in Ireland: known immune carrier of typhoid fever who infected many with the disease, institutionalized in 1914.
- typing error — an error made while using a keyboard to write something
- typographist — a person skilled in the art of typography
- underexploit — to make insufficient use of
- underpassion — an underlying or subconscious passion
- unimportance — a lack of importance
- unimportuned — without being forced or impelled
- unimprisoned — not confined in a prison
- unit process — any of a number of standard operations, such as filtration or distillation, that are widely used in various chemical and process industries
- unoppressive — not cruel or harsh
- unpatronized — having few or no patrons
- unperfection — imperfection
- unperforming — not performing
- unproclaimed — to announce or declare in an official or formal manner: to proclaim war.
- unproductive — having the power of producing; generative; creative: a productive effort.
- unprofitable — being without profit; not showing or turning a profit: a series of unprofitable ventures.
- unprohibited — to forbid (an action, activity, etc.) by authority or law: Smoking is prohibited here.
- unpropertied — owning property: the propertied class.
- unpropitious — presenting favorable conditions; favorable: propitious weather.
- unprotective — having the quality or function of protecting: a protective covering.
- unprotesting — an expression or declaration of objection, disapproval, or dissent, often in opposition to something a person is powerless to prevent or avoid: a protest against increased taxation.
- unreciprocal — given or felt by each toward the other; mutual: reciprocal respect.
- unresponding — to reply or answer in words: to respond briefly to a question.
- unresponsive — responding especially readily and sympathetically to appeals, efforts, influences, etc.: a responsive government.
- unsupporting — to bear or hold up (a load, mass, structure, part, etc.); serve as a foundation for.
- unsupportive — giving support.
- unworshipful — not worshipful; not showing reverence or admiration
- unworshipped — not worshipped; not admired or revered
- uproariously — characterized by or in a state of uproar; tumultuous.
- vaporishness — the quality or state of being vaporish
- vaporization — the act of vaporizing.
- vapour trail — A vapour trail is a white line of water vapour left in the sky by an aeroplane, a rocket, or a missile.
- variocoupler — a transformer having coils with a self-impedance that is essentially constant but a mutual impedance that can be varied by moving one coil with respect to the other.
- velcro strip — a strip or roll of Velcro, able to be cut to the required length
- velociraptor — a small carnivorous dinosaur of the genus Velociraptor , from the late Cretaceous period, capable of leaping, and growing to a length of about 6 feet (2 meters), having feathers, a flat snout, short forelimbs with large handlike talons, and a large sickle-shaped claw on each foot.
- ventripotent — having a large belly
- victory ship — a fast, turbine-powered cargo ship of World War II, having a capacity of about 11,000 dead-weight tons.