18-letter words containing r, e, t, h

threatened species — a species likely, in the near future, to become an endangered species within all or much of its range.
three-body problem — the problem of calculating the motions of three bodies in space moving under the influence of only their mutual gravitational attraction.
three-cornered hat — a triangular shaped hat which was popular in the 17th and 18th centuries; its turned up brim formed a gutter for catching rain
three-day eventing — participation in a three day equestrian competition consisting of dressage, cross-country jumping, and stadium jumping
three-quarter time — the meter of a musical composition having a time signature of 3/4 and three quarter notes or their equivalent in each measure.
throw in the towel — an absorbent cloth or paper for wiping and drying something wet, as one for the hands, face, or body after washing or bathing.
throw oneself into — to propel or cast in any way, especially to project or propel from the hand by a sudden forward motion or straightening of the arm and wrist: to throw a ball.
tip of the iceberg — a large floating mass of ice, detached from a glacier and carried out to sea.
to be caught short — If you are caught short or are taken short, you feel a sudden strong need to urinate, especially when you cannot easily find a toilet.
to be on the radar — to be noticed or important
to be on the rocks — if something such as a marriage or a business is on the rocks, it is experiencing very severe difficulties and looks likely to end very soon
to be said for sth — If you say there is a lot to be said for something, you mean you think it has a lot of good qualities or aspects.
to clear the decks — If you clear the decks, you get ready to start something new by finishing any work that has to be done or getting rid of any problems that are in the way.
to cool your heels — If you are cooling your heels, someone is deliberately keeping you waiting, so that you get bored or impatient.
to cut the mustard — If someone does not cut the mustard, their work or their performance is not as good as it should be or as good as it is expected to be.
to grit your teeth — If you grit your teeth, you make up your mind to carry on even if the situation is very difficult.
to hold your peace — If you hold or keep your peace, you do not speak, even though there is something you want or ought to say.
to learn the ropes — If you are learning the ropes, you are learning how a particular task or job is done.
to meet your match — If you meet your match, you find that you are competing or fighting against someone who you cannot beat because they are as good as you, or better than you.
to open your heart — If you open your heart or pour out your heart to someone, you tell them your most private thoughts and feelings.
to raise the alarm — If you raise the alarm or sound the alarm, you warn people of danger.
to sweep the board — If someone sweeps the board in a competition or election, they win nearly everything that it is possible to win.
to the manner born — a way of doing, being done, or happening; mode of action, occurrence, etc.: I don't like the manner in which he complained.
to watch your step — If someone tells you to watch your step, they are warning you to be careful about how you behave or what you say so that you do not get into trouble.
too clever by half — If someone is too clever by half, they are very clever and they show their cleverness in a way that annoys other people.
transit theodolite — a theodolite having a telescope that can be transited.
traveller's cheque — Traveller's cheques are cheques that you buy at a bank and take with you when you travel, for example so that you can exchange them for the currency of the country that you are in.
triarylmethane dye — any of the class of dyes containing three aryl groups attached to a central carbon atom: used chiefly for dyeing cotton, wool, and silk.
turk's-head cactus — a cactus, Melocactus communis, of Jamaica, having needlelike spines and a cylindrical body with a tawny-red, fezlike terminal part bearing red flowers.
turn on one's heel — to turn around abruptly
turn one's hand to — the terminal, prehensile part of the upper limb in humans and other primates, consisting of the wrist, metacarpal area, fingers, and thumb.
two-chamber system — the system of having two parliamentary chambers, as the House of Lords and the House of Commons in the United Kingdom
under one's breath — the air inhaled and exhaled in respiration.
under the aegis of — guided or protected by
under the jackboot — If a country or group of people is under the jackboot, they are suffering because the government is cruel and undemocratic.
university heights — a city in NE Ohio, near Cleveland.
upper klamath lake — See under Klamath Lakes.
upper palaeolithic — the latest of the three periods of the Palaeolithic, beginning about 40 000 bc and ending, in Europe, about 12 000 bc: characterized by the emergence of modern man, Homo sapiens
ur of the chaldees — the city where Abraham was born, sometimes identified with the Sumerian city of Ur. Gen. 11:28, 31; 15:7; Neh. 9:7.
urban homesteading — homesteading (def 2).
vectorcardiography — a method of determining the direction and magnitude of the electrical forces of the heart.
warehouse capacity — the amount of storage space in a warehouse
water of hydration — the portion of a hydrate that is represented as, or can be expelled as, water: now usually regarded as being in true molecular combination with the other atoms of the compound, and not existing in the compound as water.
water on the brain — hydrocephalus.
wave of the future — a trend or development that may influence or become a significant part of the future: Computerization is the wave of the future.
weather forecaster — meteorologist
west-northwestward — moving, bearing, facing, or situated toward the west-northwest.
west-southwestward — moving, bearing, facing, or situated toward the west-southwest.
western hemisphere — the western part of the terrestrial globe, including North and South America, their islands, and the surrounding waters.
westinghouse brake — a railroad air brake operated by compressed air.

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