Words starting with o
1 letter words starting with o
- o — the fifteenth letter of the English alphabet, a vowel.
- o canada — the Canadian national anthem
- o gauge — a model-railroad gauge of 1.25 inches (32 mm).
- o grade — the basic level of the Scottish Certificate of Education, now replaced by Standard Grade
- o horizon — the layer of loose leaves and organic debris at the surface of soil.
2 letter words starting with o
- o- — (in surnames of Irish Gaelic origin) descendant of
- ob — a river in the W Russian Federation in Asia, flowing NW to the Gulf of Ob. 2500 miles (4025 km) long.
- oc — (language) ("Oh see!") A parallel logic language.
- od — a hypothetical force formerly held to pervade all nature and to manifest itself in magnetism, mesmerism, chemical action, etc.
- oe — a grandchild.
3 letter words starting with o
- o-o — any of several species of Hawaiian honey eaters of the genus Moho, especially the extinct M. nobilis, of the island of Hawaii, that had black plumage and two tufts of yellow plumes used to make ceremonial robes for the Hawaiian kings.
- o/c — overcharge
- oaf — a clumsy, stupid person; lout.
- oak — any tree or shrub belonging to the genus Quercus, of the beech family, bearing the acorn as fruit.
- oap — Outside Awareness Port
4 letter words starting with o
- o'er — O'er means the same as 'over'.
- o.k. — all right; proceeding normally; satisfactory or under control: Things are OK at the moment.
- oahu — an island in central Hawaii: third largest and most important island of the state; location of Honolulu. 589 sq. mi. (1525 sq. km).
- oaks — any tree or shrub belonging to the genus Quercus, of the beech family, bearing the acorn as fruit.
- oaky — Describing the taste of wine that has been aged in oak and acquired tannins from the wood.
5 letter words starting with o
- o'day — Anita (Anita Belle Colton) 1919–2006, U.S. jazz singer.
- oaked — (of wine) matured in an oak barrel or other container.
- oaken — made of oak: the old oaken bucket.
- oakum — loose fiber obtained by untwisting and picking apart old ropes, used for caulking the seams of ships.
- oapec — Organization of Arab Petroleum Exporting Countries
6 letter words starting with o
- o'hara — Frank, 1926–66, U.S. poet.
- o'hare — an airport in Chicago.
- o-ring — a ring of pliable material, as rubber or neoprene, used as a gasket: the failure of an O-ring caused the explosion that destroyed the space shuttle Challenger in 1986.
- o.k.'d — all right; proceeding normally; satisfactory or under control: Things are OK at the moment.
- o.n.o. — In advertisements, o.n.o. is used after a price to indicate that the person who is selling something is willing to accept slightly less money than the sum they have mentioned. o.n.o. is a written abbreviation for 'or near offer'.
7 letter words starting with o
- o'boyle — Patrick Aloysius, 1896–1987, U.S. Roman Catholic clergyman: archbishop of Washington, D.C., 1947–73.
- o'brien — Edna, born 1930, Irish novelist, short-story writer, and playwright.
- o'casey — Sean [shawn,, shahn] /ʃɔn,, ʃɑn/ (Show IPA), 1880–1964, Irish playwright.
- o'clock — of, by, or according to the clock (used in specifying the hour of the day): It is now 4 o'clock.
- o'kelly — Seán Thomas [shawn,, shahn] /ʃɔn,, ʃɑn/ (Show IPA), (Sean Tomas O Ceallaigh) 1882–1966, Irish political leader: president of Ireland 1945–59.
8 letter words starting with o
9 letter words starting with o
- o'connell — Daniel, 1775–1847, Irish nationalist leader and orator.
- o'faolain — Seán [shawn] /ʃɔn/ (Show IPA), 1900–91, Irish writer and teacher.
- o'higgins — Ambrosio [ahm-braw-syaw] /ɑmˈbrɔ syɔ/ (Show IPA), (Marqués de Osorno) 1720?–1801, Irish soldier and administrator in South America.
- obamacare — a federal law providing for a fundamental reform of the U.S. healthcare and health insurance system, signed by President Barack Obama in 2010: formally called Affordable Care Act or Patient Protection and Affordable Care Act.
- obbligato — (used as a musical direction) obligatory or indispensable; so important that it cannot be omitted.
10 letter words starting with o
- o'flaherty — Liam [lee-uh m] /ˈli əm/ (Show IPA), 1896–1984, Irish novelist.
- oast-house — oast.
- obduration — the process of becoming or the state of being obdurate, intractable and indifferent
- obediently — obeying or willing to obey; complying with or submissive to authority: an obedient son.
- oberhausen — a city in W Germany, in the lower Ruhr valley.
11 letter words starting with o
- obdormition — The sensation of numbness that occurs in a limb when it \"falls asleep\" due to pressure on a nerve.
- obfuscation — to confuse, bewilder, or stupefy.
- obfuscatory — to confuse, bewilder, or stupefy.
- objectional — Objectionable.
- objectively — something that one's efforts or actions are intended to attain or accomplish; purpose; goal; target: the objective of a military attack; the objective of a fund-raising drive.
12 letter words starting with o
- obcompressed — compressed or flattened in a way opposite to the usual, as back to front instead of side to side.
- obedientiary — The holder of a monastic rank or office below that of superior.
- oberammergau — a village in S Germany, SW of Munich: famous for the passion play performed there every ten years.
- obfuscations — to confuse, bewilder, or stupefy.
- objectivized — to cause to become concrete or objective; objectify.
13 letter words starting with o
- objectionable — causing or tending to cause an objection, disapproval, or protest.
- objectionably — causing or tending to cause an objection, disapproval, or protest.
- objectiveness — something that one's efforts or actions are intended to attain or accomplish; purpose; goal; target: the objective of a military attack; the objective of a fund-raising drive.
- obliviousness — unmindful; unconscious; unaware (usually followed by of or to): She was oblivious of his admiration.
- obnoxiousness — highly objectionable or offensive; odious: obnoxious behavior.
14 letter words starting with o
- objective-case — something that one's efforts or actions are intended to attain or accomplish; purpose; goal; target: the objective of a military attack; the objective of a fund-raising drive.
- objective-lens — something that one's efforts or actions are intended to attain or accomplish; purpose; goal; target: the objective of a military attack; the objective of a fund-raising drive.
- obsequiousness — characterized by or showing servile complaisance or deference; fawning: an obsequious bow.
- obstreperously — resisting control or restraint in a difficult manner; unruly.
- obstructionism — a person who deliberately delays or prevents progress.
15 letter words starting with o
- object-oriented — pertaining to or denoting a system, programming language, etc., that supports the use of objects, as an entire image, a routine, or a data structure.
- objectification — to present as an object, especially of sight, touch, or other physical sense; make objective; externalize.
- observationally — of, relating to, or founded on observation, especially founded on observation rather than experiment.
- odontorhynchous — (of birds) having toothlike ridges inside the beak
- object-oriented programming — (programming) (OOP) The use of a class of programming languages and techniques based on the concept of an "object" which is a data structure (abstract data type) encapsulated with a set of routines, called "methods", which operate on the data. Operations on the data can only be performed via these methods, which are common to all objects that are instances of a particular "class". Thus the interface to objects is well defined, and allows the code implementing the methods to be changed so long as the interface remains the same. Each class is a separate module and has a position in a "class hierarchy". Methods or code in one class can be passed down the hierarchy to a subclass or inherited from a superclass. This is called "inheritance". A procedure call is described as invoking a method on an object (which effectively becomes the procedure's first argument), and may optionally include other arguments. The method name is looked up in the object's class to find out how to perform that operation on the given object. If the method is not defined for the object's class, it is looked for in its superclass and so on up the class hierarchy until it is found or there is no higher superclass. OOP started with SIMULA-67 around 1970 and became all-pervasive with the advent of C++, and later Java. Another popular object-oriented programming language (OOPL) is Smalltalk, a seminal example from Xerox's Palo Alto Research Center (PARC). Others include Ada, Object Pascal, Objective C, DRAGOON, BETA, Emerald, POOL, Eiffel, Self, Oblog, ESP, LOOPS, POLKA, and Python. Other languages, such as Perl and VB, permit, but do not enforce OOP.
16 letter words starting with o
20 letter words starting with o
- obsessive-compulsive — of or relating to a personality style characterized by perfectionism, indecision, conscientiousness, concern with detail, rigidity, and inhibition.
- obsessive-compulsive disorder — If someone suffers from obsessive-compulsive disorder, they cannot stop doing a particular thing, for example washing their hands.
On this page, we collect all words starting with letter O. To make easier to find the right word we have divided all 9193 words to groups according to their length. So you should go to appropriate page if can’t find the word that beginning with O. that you are searching. Also you can use this page in Scrabble.