16-letter words containing o, r, a, i

observation post — a forward position, often on high ground, from which enemy activity can be observed and, particularly, from which artillery or mortar fire can be directed.
observation ward — a ward in a hospital where patients are monitored
observationalist — One who relies on empirical observations.
observationality — The property of being observational.
occipitotemporal — (anatomy) Of or pertaining to the occiput and temporal lobe.
occupation layer — (on an archaeological site) a layer of remains left by a single culture, from which the culture can be dated or identified.
odds are against — If you say that the odds are against something or someone, you mean that they are unlikely to succeed.
oesophagogastric — (anatomy) Of or pertaining to the oesophagus and the stomach.
of a certain age — of an unspecified age, but no longer young
of it own accord — If something happens of its own accord, it seems to happen by itself, without anyone making it happen.
off-road vehicle — An off-road vehicle is a vehicle that is designed to travel over rough ground.
official referee — (in England) a circuit judge attached to the High Court who is empowered to try certain cases, esp where a detailed examination of accounts or other documents is involved
ohmic resistance — resistance (def 3a).
oil storage tank — a very large industrial container where petroleum is stored
oligodendroglial — Of or pertaining to the oligodendroglia.
oligosaccharides — Plural form of oligosaccharide.
on a trial basis — for the purpose of assessment
on a war footing — If a country or armed force is on a war footing, it is ready to fight a war.
on the breadline — impoverished; living at subsistence level
one with another — on average
one-armed bandit — slot machine (def 1).
online thesaurus — a thesaurus or dictionary of words with the same or nearly the same meanings, or synonyms, and their opposites, or antonyms, such as Thesaurus.com, available on the Internet or the World Wide Web, accessed through a web browser, and used by entering a query term into a search box on the site. An online thesaurus provides immediate electronic access to lists of alternate terms for the queried word, covering its various shades of meaning: This online thesaurus showed me that smart, as an adjective, not only means intelligent, but also stylish, or lively, and gave long lists of other words for each meaning.
open parenthesis — left parenthesis
open scholarship — a scholarship which anyone can apply for
operating budget — money allocated to a project
operating income — revenue from business operations after operating expenses are deducted from gross income.
operating manual — a leaflet of instructions on how to use something (such as an electrical appliance, etc)
operating margin — An operating margin is a ratio used to measure how well a company controls its costs, that is calculated by dividing operating income by net sales, and expressing it as a percentage.
operating profit — the profit of a company, etc, after it deducts its operating costs or the costs necessary to conduct the business
operating system — (operating system) (OS) The low-level software which handles the interface to peripheral hardware, schedules tasks, allocates storage, and presents a default interface to the user when no application program is running. The OS may be split into a kernel which is always present and various system programs which use facilities provided by the kernel to perform higher-level house-keeping tasks, often acting as servers in a client-server relationship. Some would include a graphical user interface and window system as part of the OS, others would not. The operating system loader, BIOS, or other firmware required at boot time or when installing the operating system would generally not be considered part of the operating system, though this distinction is unclear in the case of a rommable operating system such as RISC OS. The facilities an operating system provides and its general design philosophy exert an extremely strong influence on programming style and on the technical cultures that grow up around the machines on which it runs. Example operating systems include 386BSD, AIX, AOS, Amoeba, Angel, Artemis microkernel, BeOS, Brazil, COS, CP/M, CTSS, Chorus, DACNOS, DOSEXEC 2, GCOS, GEORGE 3, GEOS, ITS, KAOS, Linux, LynxOS, MPV, MS-DOS, MVS, Mach, Macintosh operating system, Microsoft Windows, MINIX, Multics, Multipop-68, Novell NetWare, OS-9, OS/2, Pick, Plan 9, QNX, RISC OS, STING, System V, System/360, TOPS-10, TOPS-20, TRUSIX, TWENEX, TYMCOM-X, Thoth, Unix, VM/CMS, VMS, VRTX, VSTa, VxWorks, WAITS.
operating-system — the collection of software that directs a computer's operations, controlling and scheduling the execution of other programs, and managing storage, input/output, and communication resources. Abbreviation: OS.
operationalizing — Present participle of operationalize.
ophthalmoparesis — (medicine) A partial or complete paralysis of the extraocular muscles which are responsible for eye movements.
optical computer — an experimental computer that uses photons rather than electrical impulses to process data a thousand times faster than with conventional integrated circuits.
optical rotation — the angle at which the plane of polarized light is rotated when passed through an optically active substance.
optical tweezers — a laser device used to study, manipulate, or trap a microscopic object, as a microorganism or cell, with nanometer precision.
orbital velocity — the minimum velocity at which a body must move to maintain a given orbit.
ordinary jubilee — the celebration of any of certain anniversaries, as the twenty-fifth (silver jubilee) fiftieth (golden jubilee) or sixtieth or seventy-fifth (diamond jubilee)
organ-pipe coral — an alcyonarian coral of the genus Tubipora, occurring in tropical waters, and forming a complex colony of brick-red, vertical tubules joined at intervals by transverse plates.
organization man — a person who subordinates his personal life to the demands of the organization he works for
organizationally — the act or process of organizing.
organized labour — labour carried out by workers in trade unions, or the workers themselves
organoleptically — In an organoleptic manner.
oriental emerald — a green variety of corundum used as a gemstone
ornithologically — In terms of ornithology.
orographic cloud — any cloud whose existence and form are largely controlled by the disturbed flow of air over and around mountains, as the banner cloud and crest cloud.
orthodox judaism — Judaism as observed by Orthodox Jews.
orthoformic acid — a hypothetical acid, HC(OH) 3 , known only in the form of its esters.
orthographically — In an orthographical manner; using proper spelling, capitalization and grammar.
orthosympathetic — Of or pertaining to the sympathetic component of the autonomic nervous system.

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