17-letter words containing i, o, n, a

observation tower — lookout, observation point
occipital condyle — a protrusion on the occipital bone of the skull that forms a joint with the first cervical vertebra, enabling the head to move relative to the neck.
ocean engineering — the branch of engineering that deals with the development of equipment and techniques for the exploration of the ocean floor and exploitation of its resources.
oceanographically — In terms of oceanography.
octadecanoic acid — stearic acid.
odds-on favourite — a person, team, horse, etc that is regarded as the most likely to win a competition
odour of sanctity — sanctimoniousness
of its own accord — If something happens of its own accord, it seems to happen by itself, without anyone making it happen.
off-year election — (in the US) an election held in a year when a presidential election does not take place
office automation — a method or system of using automated or electronic equipment, as word processors and computers, in the operations of an office.
old age pensioner — An old age pensioner is a person who is old enough to receive an pension from their employer or the government.
old south arabian — a group of four closely related Semitic languages, having a writing system and used from about the eighth to the fifth centuries b.c. in the southern part of Arabia.
old spanish trail — an overland route from Santa Fe, N. Mex., to Los Angeles, Calif., first marked out in 1776 by Spanish explorers and missionaries.
olympic mountains — a mountain range in NW Washington: part of the Coast Range. Highest peak: Mount Olympus, 2427 m (7965 ft)
olympic peninsula — a large peninsula of W Washington
omnia vincit amor — love conquers all things
omphalomesenteric — (anatomy) Of or pertaining to the umbilicus and mesentery.
on condition that — a particular mode of being of a person or thing; existing state; situation with respect to circumstances.
on someone's tail — following or shadowing someone closely
on speaking terms — the act, utterance, or discourse of a person who speaks.
on the face of it — the front part of the head, from the forehead to the chin.
on the foundation — an endowment or legacy for the perpetual support of an institution such as a school or hospital
on the heavy side — tending to be too heavy
on the pig's back — successful; established
on-street parking — parking (of a car, vehicle, etc) that is or is allowed to be done on a street
one size fits all — (of clothing) designed to fit people of a wide range of sizes.
one-parent family — A one-parent family is a family that consists of one parent and his or her children living together.
one-size-fits-all — (of clothing) designed to fit people of a wide range of sizes.
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.
onomatopoetically — the formation of a word, as cuckoo, meow, honk, or boom, by imitation of a sound made by or associated with its referent.
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.
opportunistically — adhering to a policy of opportunism; practicing opportunism.
optical astronomy — the branch of observational astronomy using telescopes to observe or photograph celestial objects in visible light.
optical carrier n — (networking) (OC-n) A SONET rate of n times 51.84 megabits per second.
optical computing — (hardware) (Or "Optical Signal Processing") Operating on data represented using electromagnetic radiation, e.g. visible light, instead of the electrical signals used in a conventional electronic digital computer. Electronic digital computers are built from transistors. These form components that store data and logic gates that perform the low-level Boolean operations such as AND, OR and NOT that are the basis of all digital computation. The optical equivalent requires material with a non-linear refractive index such that light beams can interact with each other to perform the same Boolean operations. Though the photons that carry optical signals offer some theoretical advantages over the electrons that carry electronic signals, there are many practical problems that would have to be overcome before optical computing could compete in terms of cost, power and speed.
orange flower oil — neroli oil.
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.
organic psychosis — a severe mental illness produced by damage to the brain, as a result of poisoning, alcoholism, disease, etc
organized ferment — ferment (def 1).
organized militia — a former military organization functioning under both state and federal authority.
orthogonal matrix — a matrix that is the inverse of its transpose so that any two rows or any two columns are orthogonal vectors
orthogonalization — (mathematics) The process of converting a set of functions or vectors into orthogonal ones.
orthovanadic acid — an oxyacid of vanadium, known chiefly in the form of its vanadate salts. Formula: H3VO4
osculating circle — circle of curvature.

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