17-letter words containing e, a, r, t

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-year election — (in the US) an election held in a year when a presidential election does not take place
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 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 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 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
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.
osculating circle — circle of curvature.
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.
over-appreciation — gratitude; thankful recognition: They showed their appreciation by giving him a gold watch.
over-compensation — a pronounced striving to neutralize and conceal a strong but unacceptable character trait by substituting for it an opposite trait.
over-conservative — disposed to preserve existing conditions, institutions, etc., or to restore traditional ones, and to limit change.
overconcentration — the act of concentrating; the state of being concentrated.
overdetermination — the concept that a single emotional symptom or event, as a dream or a slip of the tongue, may be caused by more than one factor.
overhead camshaft — a camshaft in an automotive engine that is located in the cylinder head over the engine block rather than in the block. Abbreviation: OHC.
overhead lighting — lighting which throws light downwards by being situated on the ceiling or having a downward shade, etc
overstep the mark — If someone oversteps the mark, they behave in a way that is considered unacceptable.
oyer and terminer — (in some U.S. states) any of various higher criminal courts.
oystershell scale — a scale insect, Lepidosaphes ulmi, having a scale shaped like the shell of an oyster, which infests various deciduous trees and shrubs.
pacific northwest — the region of North America lying north of the Columbia River and west of the Rockies
pacific tree frog — a common terrestrial frog, Hyla regilla, of western North America, having a dark stripe along each side of the head.
painted greenling — a greenling, Oxylebius pictus, inhabiting the Pacific coastal waters of North America, having a whitish body marked with black bands.
palace revolution — a challenge to or overthrow of a sovereign or other leader by members of the ruling family or group.
paleoanthropology — the study of the origins and predecessors of the present human species, using fossils and other remains.
paleobiochemistry — the study of biochemical processes that occurred in fossil life forms.
paleoconservative — a person advocating an older, traditional type of conservatism, especially in politics.
palette of narmer — a king of Egypt identified by modern scholars as the Menes of tradition and depicted as the unifier of Upper and Lower Egypt on an ancient slate tablet (Narmer Palette or Palette of Narmer) c3200 b.c. with relief carvings on both sides.
pan potentiometer — a control on a stereo sound mixing desk by means of which the relative levels in right- and left-hand channels can be adjusted and hence the apparent position of the recorded or broadcast sound source within the stereo panorama can be controlled

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