Dictionary.com
Thesaurus.com
Jump To:
  • 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.


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.


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.


ob. 4 American  

abbreviation

  1. he died; she died.


ob. 5 American  

abbreviation

  1. incidentally.


ob. 6 American  

abbreviation

  1. oboe.

  2. Meteorology. observation.


O.B. 7 American  
Or O/B.

abbreviation

  1. opening of books.

  2. ordered back.


ob. 1 British  

abbreviation

  1. (on tombstones) obiit

  2. obiter

  3. oboe

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

OB 2 British  

abbreviation

  1. Old Boy

  2. outside broadcast

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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)

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

ob- 4 British  

prefix

  1. inverse or inversely

    obovate

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

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 said nothing about the place except that he used to go fishing with a man who lived in it years ago.

From "Missing May" by Cynthia Rylant

“I was going to the hospital, I was vocal, I was saying, here’s my OB, here’s my records, she’s saying explicitly, this is ectopic, and none of the ER doctors would respond.”

From Salon May 26, 2026

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

Put FC = h, and MC = x, and OB = l.

From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 5 "Clervaux" to "Cockade" by Various

When the land suddenly slides, most of the old familiar patterns are ob- literated�and Johnson's triumph was achieved by smashing across regional, economic and ideological lines that had long held firm for the G.O.P.

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

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

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 Surtees, Scott

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 Mendoza, Juan Gonzalez de

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

Man'dĕ -ʞaⁿ ¢aⁿ ukínacke gaxá- biamá, kĭ síg¢e ¢é -hnaⁿ tĕ ĕ'di i¢aⁿ'¢a- bow string the ob. noose he made it they say, and trail went habitually the there he put it 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

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

Some is attributable to Ke Huy Quan's onboarding as O.B., the TVA's hidden tech genius, and our reminder that not everything that happened to the multiverse between 2021 and now was terrible.

From Salon Oct. 5, 2023

Jackson’s water system has been beset by problems for decades, but the latest troubles began in late August after heavy rainfall exacerbated problems at the O.B.

From Seattle Times Nov. 10, 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

One result of this controversy was that in 1873 it having come to the attention of Rev. O.B.

From Unitarianism in America by Cooke, George Willis

Vocabulary.com logo
by dictionary.com

Join 12,000,000 vocabulary learners

Start learning new words today on VocabTrainer.
You'll remember them forever.

Start training