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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 a deep thinker and he was often getting revelations.

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

“It’s really hard to find an OB last minute, so they should try to utilize their OB-GYN’s network,” she said.

From Los Angeles Times ● Jan. 11, 2025

Around 9:30 a.m., the OB on duty, Dr. Marcelo Totorica, couldn’t find a fetal heart rate, according to records; he told the family he was sorry for their loss.

From Salon ● Nov. 1, 2024

So that for all such points OA · OA' = OB · OB' = OC · OC'.

From An Elementary Course in Synthetic Projective Geometry by Lehmer, Derrick Norman

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

He is a marvelous ob- server of externals and sometimes� but not always�of inner truths about his sitters.

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

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

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

Grandmother, bow string the ob. ag¢íze kaⁿbdédegaⁿ aⁿ'baaze -hnaⁿ'i hă, á- biamá.

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

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 Robinson, Therese Albertine Louise von Jacob

E la ou les 4 prenent 7 d. ob. le iour e le quint pur ceo qil est lyour le iour 2 d., donqe devez donner pur lacre 4 den.

From Villainage in England Essays in English Mediaeval History by Vinogradoff, Paul

Sarah Finn, the casting director on “Loki” who also worked on “Everything Everywhere,” recommended Quan for the role of O.B. after seeing the film at a cast and crew screening.

From Los Angeles Times ● Nov. 27, 2023

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

From Salon ● Nov. 9, 2023

Among seven water and sewer system upgrades, the funds will be used to help replace a raw water pump at the beleaguered O.B.

From Seattle Times ● Nov. 4, 2022

“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

But there were plenty of isolated good things, such as Mr. O.B.

From Punch, or the London Charivari, Volume 152, February 14, 1917 by Seaman, Owen, Sir