15-letter words containing o, u, t, r
- obstacle course — a military training area having obstacles, as hurdles, ditches, and walls, that must be surmounted or crossed in succession.
- obstructionists — Plural form of obstructionist.
- obstructiveness — The characteristic of being obstructive.
- obtuse triangle — a triangle with one obtuse angle.
- octanitrocubane — (organic compound) A high explosive derived from cubane.
- odd permutation — a permutation of a set of n elements, x 1 , x 2 , …, xn, which permutes the product of all differences of the form (xi – xj), where i is less than j, into the negative of the product.
- odontorhynchous — (of birds) having toothlike ridges inside the beak
- okhotsk current — a cold ocean current flowing SW from the Bering Sea, E of the Kurile Islands, along the E coast of Japan where it meets the Japan Current.
- omnium gatherum — a miscellaneous collection.
- omnium-gatherum — a miscellaneous collection.
- one's last hour — the time of one's death
- open university — higher education by correspondence
- open your mouth — If you say that someone does not open their mouth, you are emphasizing that they never say anything at all.
- opposite number — counterpart; equivalent: New members with an interest in folk art will find their opposite numbers in the association's directory.
- ordered n-tuple — a set of n objects or quantities, where n is an integer, especially such a set arranged in a specified order (ordered n-tuple)
- ornithorhynchus — the platypus.
- ortho-toluidine — Chemistry. a light-yellow, very slightly water-soluble liquid, C 7 H 9 N, the ortho isomer of toluidine: used in the manufacture of dyes, saccharin, and other organic compounds, and in textile printing processes.
- orthodox church — the Christian church comprising the local and national Eastern churches that are in communion with the ecumenical patriarch of Constantinople; Byzantine Church.
- ostreiculturist — a person who breeds oysters
- out of practice — If you are out of practice at doing something, you have not had much experience of it recently, although you used to do it a lot or be quite good at it.
- out of thin air — suddenly and unexpectedly
- out of training — become unfit
- out on your ear — If someone says that you will be out on your ear, they mean that you will be forced to leave a job, an organization or a place suddenly.
- outdoorsmanship — a person devoted to outdoor sports and recreational activities, as hiking, hunting, fishing, or camping.
- outer barrister — a barrister belonging to the outer bar.
- outline drawing — a drawing consisting only of external lines
- outreach worker — a person who does work designed to help and encourage disadvantaged members of the community
- outside caliper — a caliper whose legs turn inward so that it can measure outside dimensions, as the diameter of a rod.
- outside forward — one of two attacking players who usually play on the far side of the field; wing.
- outward journey — a journey leaving for a particular destination (as opposed top one returning home)
- outward-looking — looking beyond oneself; open-minded and reaching out to other people, organizations, etc
- over-accentuate — to give emphasis or prominence to.
- over-articulate — excessively articulate
- over-cultivated — to prepare and work on (land) in order to raise crops; till.
- over-enthusiasm — absorbing or controlling possession of the mind by any interest or pursuit; lively interest: He shows marked enthusiasm for his studies.
- over-particular — of or relating to a single or specific person, thing, group, class, occasion, etc., rather than to others or all; special rather than general: one's particular interests in books.
- over-population — to fill with an excessive number of people, straining available resources and facilities: Expanding industry has overpopulated the western suburbs.
- over-regulation — a law, rule, or other order prescribed by authority, especially to regulate conduct.
- over-solicitous — too solicitous: oversolicitous concerning one's health.
- over-structured — excessively structured or organized.
- overcommunicate — to communicate excessively
- overconsumption — the act of consuming, as by use, decay, or destruction.
- overcultivation — the act or art of cultivating.
- overexpenditure — the act of expending something, especially funds; disbursement; consumption.
- overspeculation — the contemplation or consideration of some subject: to engage in speculation on humanity's ultimate destiny.
- overstimulation — to rouse to action or effort, as by encouragement or pressure; spur on; incite: to stimulate his interest in mathematics.
- overthrust belt — an elongate area in which thick rock layers have been pushed over one another by compressional forces within the earth's crust.
- overutilization — to put to use; turn to profitable account: to utilize a stream to power a mill.
- oyster mushroom — oyster cap.
- ozark mountains — an eroded plateau in S Missouri, N Arkansas, and NE Oklahoma. Area: about 130 000 sq km (50 000 sq miles)