17-letter words containing t, e, r

numerical control — control of a machine tool, or other device used in a manufacturing process, by a computer, other control circuitry, or recorded digital commands.
nursery education — education provided at a school for young children, usually from three to five years old
nyquist frequency — (DSP) The highest frequency that can be represented in a digital signal of a specified sampling frequency. It is equal to one-half of the sampling rate. See Nyquist Theorem.
object identifier — (programming) (OID) Generally an implementation-specific integer or pointer that uniquely identifies an object.
observation tower — lookout, observation point
odds-on favourite — a person, team, horse, etc that is regarded as the most likely to win a competition
off one's trolley — trolley car.
off-year election — (in the US) an election held in a year when a presidential election does not take place
oil of turpentine — a colorless, flammable, volatile essential oil having a penetrating odor and a pungent, bitter taste, obtained from turpentine oleoresin by distillation: used in paints and varnishes, and in medicine as a carminative, vermifuge, expectorant, rubefacient, and, formerly, as a diuretic.
old red sandstone — a thick sequence of sedimentary rock (generally, but not always, red) deposited in Britain and NW Europe during the Devonian period
omphalomesenteric — (anatomy) Of or pertaining to the umbilicus and mesentery.
on cruise control — If you say that someone is on cruise control in a contest, you mean that they are winning the contest easily and without needing to make a lot of effort.
on one's doorstep — very close or accessible
on speaking terms — the act, utterance, or discourse of a person who speaks.
on the barrelhead — upon being presented for sale; at the time of delivery
on the front foot — at an advantage, outclassing and outmanoeuvring one's opponents
on the home front — domestically
on the other hand — the terminal, prehensile part of the upper limb in humans and other primates, consisting of the wrist, metacarpal area, fingers, and thumb.
on the right foot — in an auspicious manner
on the wrong foot — in an inauspicious manner
on the wrong tack — a short, sharp-pointed nail, usually with a flat, broad head.
on-street parking — parking (of a car, vehicle, etc) that is or is allowed to be done on a street
on-the-job injury — On-the-job injury is bodily harm that is caused while you are doing your job.
once over lightly — a hasty or superficial treatment, look, examination, etc.; once-over: The maid gave the room the once-over-lightly.
once-over-lightly — a hasty or superficial treatment, look, examination, etc.; once-over: The maid gave the room the once-over-lightly.
one for the books — a handwritten or printed work of fiction or nonfiction, usually on sheets of paper fastened or bound together within covers.
one-parent family — A one-parent family is a family that consists of one parent and his or her children living together.
one-time password — (security) (OTP) A security system that requires a new password every time a user authenticates themselves, thus protecting against an intruder replaying an intercepted password. OTP generates passwords using either the MD4 or MD5 hashing algorithms. The equivalent term "S/Key", developed by Bellcore, is a trademark of Telcordia Technologies, so the name OTP is used increasingly. See RFC 1760 - "The S/KEY One-Time Password System" and RFC 1938 - "A One-Time Password System".
online dictionary — a dictionary that is available on the Internet or World Wide Web and accessed through a Web browser using a computer or a mobile device, primarily by typing a query term into a search box on the site. Online dictionaries like Dictionary.com offer immediate, direct access through large databases to a word's spelling and meanings, plus a host of ancillary information, including its variant spellings, pronunciation, inflected forms, origin, and derived forms, as well as supplementary notes on matters of interest or concern about how the word is used: Some people think online dictionaries will make print dictionaries obsolete.
open-end mortgage — a mortgage agreement against which new sums of money may be borrowed under certain conditions.
opening arguments — the statements or arguments provided by lawyers at the beginning of a trial
operating theatre — An operating theatre is a special room in a hospital where surgeons carry out medical operations.
operation sealion — the codename for Hitler's proposed invasion (1940) of Great Britain
operations centre — a centre where activities of a business, organization, etc, are administrated and take place
opisthobranchiate — (zoology) Of or pertaining to the Opisthobranchiata.
optical carrier 3 — (networking) (OC-3) A SONET rate of 3 * 51.84 = 155.52 megabits per second, which matches STS-3.
optical carrier n — (networking) (OC-n) A SONET rate of n times 51.84 megabits per second.
optical isomerism — stereoisomerism in which the isomers are identical in molecular weight and most chemical and physical properties but differ in their effect on the rotation of polarized light.
orange free state — a province in central Republic of South Africa: a Boer republic 1854–1900; a British colony (Orange River Colony, ) 1900–10. 49,647 sq. mi. (128,586 sq. km). Capital: Bloemfontein.
organ-pipe cactus — a treelike or columnar cactus, Lemaireocereus marginatus, of Mexico, having a central, erect spine surrounded by spreading spines in clusters of five to eight, and funnel-shaped, brownish-purple flowers.
organic chemistry — the branch of chemistry, originally limited to substances found only in living organisms, dealing with the compounds of carbon.
organized ferment — ferment (def 1).
organized militia — a former military organization functioning under both state and federal authority.
ortho-nitrophenol — any compound derived from phenol by the replacement of one or more of its ring hydrogen atoms by the nitro group.
osculating circle — circle of curvature.
other fish to fry — any of various cold-blooded, aquatic vertebrates, having gills, commonly fins, and typically an elongated body covered with scales.
out for the count — If someone is out for the count, they are unconscious or very deeply asleep.
out of all reason — unreasonable
outline agreement — a contract, etc, setting out the preliminary terms or guidelines for an agreement; a preliminary agreement
outside broadcast — An outside broadcast is a radio or television programme that is not recorded or filmed in a studio, but in another building or in the open air.

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