18-letter words containing a, e, r, o, d, u
- sun-dried tomatoes — tomatoes that have been dried or preserved by exposure to the sun
- supraorbital ridge — browridge.
- tertiary education — education, following secondary education at a school, at a college or university
- theodore gericault — (Jean Louis André) Théodore [zhahn lwee ahn-drey tey-aw-dawr] /ʒɑ̃ lwi ɑ̃ˈdreɪ teɪ ɔˈdɔr/ (Show IPA), 1791–1824, French painter.
- thioarsenious acid — any of a group of hypothetical acids, H3AsS3, HAsS2, and H4As2S5, known only in the forms of their salts
- to be above ground — to be alive
- 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 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 speak your mind — If you speak your mind, you say firmly and honestly what you think about a situation, even if this may offend or upset people.
- tristan und isolde — a music drama (composed, 1857–59; première, 1865) by Richard Wagner.
- 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.
- ultrasonic welding — the use of high-energy vibration of ultrasonic frequency to produce a weld between two components which are held in close contact
- ultrasound scanner — a device used to examine an internal bodily structure by the use of ultrasonic waves, esp for the diagnosis of abnormality in a fetus
- under (one's) seal — in a document authenticated by one's seal
- under lock and key — a device for securing a door, gate, lid, drawer, or the like in position when closed, consisting of a bolt or system of bolts propelled and withdrawn by a mechanism operated by a key, dial, etc.
- 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.
- under-compensation — to compensate or pay less than is fair, customary, or expected.
- under-depreciation — decrease in value due to wear and tear, decay, decline in price, etc.
- under-registration — the act of registering.
- 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).
- video surveillance — a system of monitoring activity in an area or building using a television system in which signals are transmitted from a television camera to the receivers by cables or telephone links forming a closed circuit
- west-southwestward — moving, bearing, facing, or situated toward the west-southwest.
- xenon hexafluoride — a colorless, crystalline compound, XeF 6 , that melts at 50°C to a yellow liquid, and boils at 75°C.