OAS or Oas may refer to:

Chemistry

O-Acetylserine ''O''-Acetylserine is an α-amino acid with the chemical formula HO2CCH(NH2)CH2OC(O)CH3. It is an intermediate in the biosynthesis of the common amino acid cysteine in bacteria and plants. ''O''-Acetylserine is biosynthesized by acetylation of ...

, amino-acid involved in cysteine synthesis

Computers

Open-Architecture-System Open-Architecture-System (OAS) is the main User interface and synthesizer software of the Wersi keyboard line. OAS improves on prior organ interfaces by allowing the user to add sounds, rhythms, third party programs and future software enhancemen ...

, the main user interface of Wersi musical keyboards *

OpenAPI Specification The OpenAPI Specification, previously known as the Swagger Specification, is a Specification (technical standard), specification for a Machine-readable medium, machine-readable interface definition language for describing, producing, consuming and ...

(originally Swagger Specification), specification for machine-readable interface files for RESTful Web services *

Oracle Application Server Oracle Fusion Middleware (FMW, also known as Fusion Middleware) consists of several software products from Oracle Corporation. FMW spans multiple services, including Java EE and developer tools, integration services, business intelligence, col ...

, software platform

Medicine

Open aortic surgery Open aortic surgery (OAS), also known as open aortic repair (OAR), describes a technique whereby an abdominal, thoracic or retroperitoneal surgical incision is used to visualize and control the aorta for purposes of treatment, usually by the repla ...

, surgical technique *

Oral allergy syndrome Oral allergy syndrome (OAS) or pollen-food allergy syndrome (PFAS) is a type of allergy classified by a cluster of allergic reactions in the mouth and throat in response to eating certain (usually fresh) fruits, nuts, and vegetables. It typically ...

, food-related allergic reaction in the mouth *

2'-5'-oligoadenylate synthase In molecular biology, 2'-5'-oligoadenylate synthetase (2-5A synthetase) is an enzyme () that reacts to interferon signal. It is an antiviral enzyme that counteracts virus, viral attack by degrading RNAs, both viral and host. The enzyme uses Adenosi ...

, an enzyme ** OAS1, OAS2,

OAS3 2'-5'-oligoadenylate synthetase 3 is an enzyme that in humans is encoded by the ''OAS3'' gene. This gene encodes an enzyme included in the 2', 5' oligoadenylate synthase family. This enzyme is induced by interferons and catalyzes the 2', 5' ol ...

, anti-viral enzymes in humans

Organizations

* Office of Aviation Services, agency of the

United States Department of the Interior The United States Department of the Interior (DOI) is an United States federal executive departments, executive department of the Federal government of the United States, U.S. federal government responsible for the management and conservation ...

Ontario Archaeological Society The Ontario Archaeological Society is a registered charitable organization promoting the ethical practice of archaeology within the Province of Ontario, Canada. It is a public and professional society formed in 1958. The Society produces a p ...

, organization promoting archaeology within the Province of Ontario, Canada *

Organisation Armée Secrète The ''Organisation armée secrète'' (OAS, "Secret Army Organisation") was a far-right dissident French paramilitary and terrorist organisation during the Algerian War, founded in 1961 by Raoul Salan, Pierre Lagaillarde and Jean-Jacques S ...

, French dissident terrorist organisation, active during the Algerian War (1954–1962), fighting against Algerian independence *

Organization of American States The Organization of American States (OAS or OEA; ; ; ) is an international organization founded on 30 April 1948 to promote cooperation among its member states within the Americas. Headquartered in Washington, D.C., United States, the OAS is ...

, continental organization of the Western Hemisphere *

Oxford Art Society The Oxford Art Society (OAS) is a society for artists based in the city of Oxford, England. The society was established in 1891 by Walter Tyrwhitt, with the aim of encouraging art in the city of Oxford and also the University of Oxford, Universi ...

, society for artists in the city of Oxford, England

Transport

* Oasis LRT station, Singapore, LRT station abbreviation OAS

Other

Ohio Auction School The Ohio Auction School (OAS) is an auction school located near Columbus, Ohio, United States. Many states require that individuals complete a course of study at a state approved auction school in order to be licensed to practice in that state. T ...

, school for auctioneers in Ohio, U.S. *

Old Age Security The Old Age Security (OAS, ) program is a universal retirement pension available to most residents and citizens of Canada who have reached 65 years old. This pension is supplemented by the Guaranteed Income Supplement (GIS), which is added to the ...

, social security payment available to most Canadians aged 65 or older *

Option-adjusted spread Option-adjusted spread (OAS) is the yield spread which has to be added to a benchmark yield curve to discount a security's payments to match its market price, using a dynamic pricing model that accounts for embedded options. OAS is hence mode ...

, the yield-curve spread of a fixed-income security, adjusted for the cost of embedded options *

Oas, Albay Oas, officially the Municipality of Oas (; ), is a municipality in the province of Albay, Philippines. According to the 2020 census, it has a population of 66,084 people. Etymology There are two stories that purport to tell the origin of the ...