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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

I’d lie there a few minutes, enjoying, in a way, the strangeness of my situation; then I’d groan and drag myself up to get Ob and May.

From "Missing May" by Cynthia Rylant

The documentation showed OB Projects' letter of engagement addressed to Mercury partner Bryan Lanza, a Republican strategist and former Trump elections campaign communications director.

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

Vaughn, a D.C. correspondent for the business network since 2016, was told during a routine OB appointment that it was baby time, she told People exclusively.

From Los Angeles Times ● Apr. 24, 2025

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

From Salon ● Sep. 17, 2024

Bisect the chord PB at G, and draw through G a line perpendicular to PB, intersecting BB′ in O. An arc with centre O and radius OB forms part of a curve.

From Encyclopaedia Britannica, 11th Edition, Volume 9, Slice 3 "Electrostatics" to "Engis" 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

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

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

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

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 Richard Hakluyt

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 Augustus J. Thebaud

Two pounde of hennes fleshe, goose, or ducke, is worth two Foi of their money, that is, d. ob. sterling.

From The History of the Great and Mighty Kingdom of China and the Situation Thereof, Volume I (of 2) by Juan Gonzalez de Mendoza

It cameto pass morning very snare the ob. to seehis own arrived they say.

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

I am, sir, Your most ob. serv't, Wm.

From Tea Leaves Being a Collection of Letters and Documents relating to the shipment of Tea to the American Colonies in the year 1773, by the East India Tea Company. (With an introduction, notes, and biographical notices of the Boston Tea Party) by Francis S. (Francis Samuel) Drake

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

“You’ve been paying into Social Security your whole life,” Mr. Biden told an audience at O.B.

From New York Times ● Nov. 1, 2022

Lumumba also said the city is pressing ahead with plans to secure a private firm to operate the O.B.

From Seattle Times ● Oct. 31, 2022

Johnson was a candidate for a high and honorable office, Anthony Shane is represented by the reverend O.B.

From Life of Tecumseh, and of His Brother the Prophet With a Historical Sketch of the Shawanoe Indians by Benjamin Drake