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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

Somehow the topic turned to lighter things, and Ob and Mr. Underwood talked of the weather and the new bridge being built down the road.

From "Missing May" by Cynthia Rylant

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

Paul Barrow, 38, who plays on the wing for Collegiate OB, faced former Wigan full-back Figueroa on Sunday - and had to explain to his nine-year-old son who Heskey was.

From BBC ● Oct. 21, 2025

She was told to follow up with her OB at her next appointment in three days.

From Salon ● Jul. 2, 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

OB, where OB is measured along the arc.

From Encyclopaedia Britannica, 11th Edition, Volume 4, Part 4 "Bulgaria" to "Calgary" by Various

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

From Time Magazine Archive

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

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

Here lyes the body of William Wheatley, ob. 10th Nov. 1683.

From William Shakespere, of Stratford-on-Avon His Epitaph Unearthed, and the Author of the Plays run to Ground by Scott Surtees

Gornicki, ob. after 1591, Czarnkowski, Odachowski, and others, but especially the first named, were considered as the most distinguished orators of the age.

From Historical View of the Languages and Literature of the Slavic Nations by Therese Albertine Louise von Jacob Robinson

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

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

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

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

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

From Los Angeles Times ● Nov. 27, 2023

“With science, it’s all what and how,” says O.B.

From Salon ● Nov. 9, 2023

The woman, whose name was not released, was taken to the O.B.

From Seattle Times ● Feb. 6, 2023

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

At the first meeting the speakers were O.B.

From Unitarianism in America by George Willis Cooke