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• Ob
  Ob

  noun

  a river in the W Russian Federation in Asia, flowing NW to the Gulf of Ob. 2,500 miles (4,025 km) long.
• OB
  OB

  abbreviation

  Also ob
• ob-
  ob-

  a prefix meaning “toward,” “to,” “on,” “over,” “against,” originally occurring in loanwords from Latin, but now used also, with the sense of “reversely,” “inversely,” to form New Latin and English scientific terms: object; obligate; oblanceolate.
• ob.
  ob.

  abbreviation

  he died; she died.
• O.B.
  O.B.

  abbreviation

  opening of books.

Ob

¹ American  

[awb, ob, awp] / ɔb, ɒb, ɔp /

noun

1. a river in the W Russian Federation in Asia, flowing NW to the Gulf of Ob. 2,500 miles (4,025 km) long.

2. Gulf of, an inlet of the Arctic Ocean. About 500 miles (800 km) long.

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OB ² American  

abbreviation

1. Medicine/Medical. Also ob

   1. obstetric.

   2. obstetrician.

   3. obstetrics.

2. off Broadway.

3. opening of books.

4. ordered back.

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ob- ³ American  

1. a prefix meaning “toward,” “to,” “on,” “over,” “against,” originally occurring in loanwords from Latin, but now used also, with the sense of “reversely,” “inversely,” to form New Latin and English scientific terms: object; obligate; oblanceolate.

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ob. ⁴ American  

abbreviation

1. he died; she died.

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ob. ⁵ American  

abbreviation

1. incidentally.

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ob. ⁶ American  

abbreviation

1. oboe.

2. Meteorology. observation.

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O.B. ⁷ American  

Or O/B.

abbreviation

1. opening of books.

2. ordered back.

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ob. ¹ British  

abbreviation

1. (on tombstones) obiit

2. obiter

3. oboe

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OB ² British  

abbreviation

1. Old Boy

2. outside broadcast

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Ob ³ British  

/ ɔpj /

noun

1. a river in N central Russia, formed at Bisk by the confluence of the Biya and Katun Rivers and flowing generally north to the Gulf of Ob (an inlet of the Arctic Ocean): one of the largest rivers in the world, with a drainage basin of about 2 930 000 sq km (1 131 000 sq miles). Length: 3682 km (2287 miles)

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ob- ⁴ British  

prefix

1. inverse or inversely

   obovate

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Etymology

Origin of ob-³

Middle English (from Old French ) from Latin, representing ob (preposition); in some scientific terms, from New Latin, Latin ob- (prefix)

Origin of ob.⁴

From the Latin word obiit

Origin of ob.⁵

From the Latin word obiter

Example Sentences

See Examples For:

Ob OB ob- ob. O.B.

Water levels in both the Ishim and the Tobol, which form part of the world's seventh longest Ob river system, are not expected to peak until 23 or 24 April.

From BBC ● Apr. 16, 2024

All of this has a number of implications for the Arctic: northern rivers, especially the region's largest, the Ob, Yenesey, Lena and Mackenzie, will see proportionally more water coming from their northern reaches.

From Science Daily ● Mar. 5, 2024

Poor ol' RiP will try to buck the trend but, as Ob pointed out, it's one facade in public and another in private. 

From Time ● Apr. 30, 2013

‘They stand, and they withstand’: the nomadic Nenets photographed by Sebastião Salgado: north of the Ob river, inside the Arctic Circle, Yamal Peninsula, Siberia, 2011.

From The Guardian ● Apr. 13, 2013

Ob was never embarrassed about being a disabled navy man who fiddled with whirligigs all day long, and I never was embarrassed about being a kid who’d been passed around for years.

From "Missing May" by Cynthia Rylant

This was done via OB Projects Management, a South African business consultancy firm that has said it is representing the Zimbabwean farmers.

From BBC ● Mar. 14, 2026

I called my OB to check on the slightest twitch or pain at all times of day or night.

From The Wall Street Journal ● Oct. 23, 2025

Endeavor said it will sell two of its properties to OB Global Holdings LLC, in a management buyout backed by Endeavor CEO Ari Emanuel.

From Los Angeles Times ● May 1, 2025

But that didn’t happen the following morning, even when an OB diagnosed “acute severe sepsis.”

From Salon ● Sep. 17, 2024

OC is the axis xy whilst OA and OB are the traces of the third plane.

From Encyclopaedia Britannica, 11th Edition, Volume 11, Slice 6 "Geodesy" to "Geometry" by Various

Carter begins not only with that advantage but also, as an outsider, he is free of many heavy ob- ligations to special groups.

From Time Magazine Archive

A subscription of $1,000 was voted to help ob- tain a pardon for Mooney.

From Time Magazine Archive

This ob- noxious tonic possesses many of the vitamins necessary to discourage rickets, gives strength to rickety children.

From Time Magazine Archive

And in the opinion of Washington ob- servers he was not likely to compromise unless Recession grew even blacker.

From Time Magazine Archive

The school created the very first teaching hospital in the world, a place where the sick were treated and young doctors learned their craft, as well as a fine ob- servatory to track the heavens.

From "Sugar Changed the World: A Story of Magic, Spice, Slavery, Freedom, and Science" by Marc Aronson

Near the site of this ancient sanctuary stood a tomb, inscribed, 'John Michael Brown, ob. 15th December, A. D. 1750.

From Irish Race in the Past and the Present by Thebaud, Augustus J.

Two pound of hennes flesh, geese, or ducke, is worth two foi of their money, that is, d. ob. sterling.

From The Principal Navigations, Voyages, Traffiques and Discoveries of the English Nation — Volume 11 by Hakluyt, Richard

John Arderne, will June 5, 1605; ob. s. p.

From Shakespeare's Family by Stopes, C. C. (Charlotte Carmichael)

St Bernard, 1091-1153; Bernard of Morlaix, exact years uncertain, but twelfth century; Adam of St Victor, ob. cir.

From The Flourishing of Romance and the Rise of Allegory (Periods of European Literature, vol. II) by Saintsbury, George

Person the mv. ob. now I-first I go will I who, thought they say.

From Illustration Of The Method Of Recording Indian Languages From the First Annual Report of the Bureau of Ethnology, Smithsonian Institution by Gatschet, Albert Samuel

A 2022 Jackson, Mississippi outage at the O.B.

From Salon ● Aug. 8, 2024

He’s even wearing a pin of O.B. on his black jacket.

From Los Angeles Times ● Nov. 27, 2023

Jackson city council members voted Thursday to hire contract workers from a Los Angeles-based company to staff the O.B.

From Seattle Times ● Nov. 10, 2022

Adding to the system’s problems, late August brought days of heavy rains and flooding in central Mississippi, and the O.B.

From New York Times ● Sep. 16, 2022

By Samuel Johnson, with an introduction by O.B.

From The Bay State Monthly, Volume 3, No. 2 by Various