English Words: O

1,431 words · Page 19 of 29

orthodonticadj

Of, or relating to the dental speciality of orthodontics.

orthodonticsnoun

A specialty of dentistry concerned with correcting misalignment of teeth.

orthodontistnoun

An orthodontic dentist.

orthodoxadj

Conforming to the accepted, established, or traditional doctrines of a given faith, religion, or ideology.

orthodoxynoun

Correctness of doctrine and belief in regard to any doctrinal (i.e. philosophical or theological) system.

orthogonaladj

Of two objects, at right angles; perpendicular to each other.

orthographicadj

Of a projection used in maps, architecture etc., in which the rays are parallel.

orthographynoun

A method of representing a language or the sounds of language by written symbols; spelling.

orthonormaladj

Of a set of vectors, both orthogonal and normalized.

orthopedicadj

Of or relating to orthopedics.

orthopedicsnoun

The branch of medicine that deals with the prevention or correction of disorders of the bones and associated muscles and joints

orthopedistnoun

A surgeon who specializes in orthopedics.

orthorhombicadj

Having three unequal axes at right angles.

orthostaticadj

Relating to orthostasis or orthostatism.

Ortizname

A surname from Spanish.

Ortonname

A surname.

orvalnoun

A sage, of species Salvia viridis.

Orvietoname

A town in the province of Terni, Umbria, Italy.

Orvillename

A male given name originating as a coinage.

Orwellname

A village and civil parish in South Cambridgeshire district, Cambridgeshire, England (OS grid ref TL3650).

Orwellianadj

Resembling the totalitarian political methods decried in the works of writer George Orwell, particularly in the dystopian novel Nineteen Eighty-Four; characterized by use of misleading terminology, propaganda, censorship, surveillance and repression.

oryxnoun

Any of several antelopes, of the genus Oryx, native to Africa, which have long, straight horns

OSname

Initialism of Owen Sound.

Osagenoun

A member of the Osage Nation.

Osakaname

The capital city of Osaka Prefecture, Japan.

Osamaname

A male given name from Arabic.

Osamuname

A male given name from Japanese.

Osbornname

An English surname transferred from the given name.

Osbornename

An English surname transferred from the given name.

Osbournename

Alternative spelling of Osborne.

Oscarname

A male given name from Irish or Old English.

Osceolaname

A community in Admaston/Bromley, Renfrew County, Ontario, Canada.

oscillateverb

To swing back and forth, especially if with a regular rhythm.

oscillatingadj

Moving in a repeated back-and-forth motion; coming and going.

oscillationnoun

the act of oscillating or the state of being oscillated

oscillatornoun

A tuned electronic circuit used to generate a continuous output waveform.

oscillatoryadj

That oscillates; oscillating.

oscilloscopenoun

An electronic measuring instrument that creates a visible two-dimensional graph, on a screen, of one or more continuously varying voltages or currents.

Oshname

The second-largest city in Kyrgyzstan.

OSHAname

Acronym of Occupational Safety and Health Administration.

Oshawaname

A city in the Regional Municipality of Durham, Ontario, Canada.

Oshkoshname

A small city, the county seat of Garden County, Nebraska, United States.

Oshoname

A religious and spiritual leader from India.

OSIname

Initialism of Open Systems Interconnection, an International Standard ISO/IEC 7894:1994(E) subtitled Basic Reference Model, containing a formal description of an idealized computer network architecture.

Osirisname

The Egyptian god of the dead and of the underworld.

Osloname

A county and municipality, the capital city of Norway. Formerly called Christiania and Kristiania.

osmadj

awesome; like OK, can be used to express enthusiastic approval.

Osmanname

A male given name from the Germanic languages, variant of Osmond, rare in English.

Osmentname

A surname.

osmiumnoun

A chemical element (symbol Os) with atomic number 76: a hard, brittle, heavy, bluish-white transition metal found as a trace element in alloys, mostly in platinum ores.

Spelling & Dictionary Insight

The English alphabetical index for the letter O contains 1,431 headwords drawn from our Wiktionary-derived dictionary table. At 50 entries per page the browse splits into 29 pages, and you are currently viewing page 19. Every row above is a dictionary-backed entry with a canonical slug, and each links through to a full definition page with pronunciation, senses, etymology, and related-word data where available.

On this page 50 of 50 entries carry a part-of-speech tag and 50 carry at least one stored definition. Coverage varies across letters because Wiktionary volunteers build entries at different speeds for different parts of the alphabet, letters with common starting sounds (S, C, T, P) usually have the densest coverage, while less frequent starters (X, Q, Z) tend to have shorter but more specialised lists. PlainSpell surfaces whatever data is present and links back to the source when a definition is not yet recorded.

For readers using this index as a spelling reference, the guarantee is that every form you see on the list is a documented English headword, not a guess, not a derived inflection lacking a lemma row. If a word you expected to find is absent from the "O" list, it usually means the form exists only as an inflection of another lemma (e.g. a past participle stored under the infinitive) or the entry has not yet been imported from Wiktionary. Use the search bar or the misspelling lookup to resolve these cases.