[awb, ob; Russian awp]
  1. a river in the W Russian Federation in Asia, flowing NW to the Gulf of Ob. 2500 miles (4025 km) long.
  2. Gulf of, an inlet of the Arctic Ocean. About 500 miles (800 km) long.


  1. Also ob  Medicine/Medical.
    1. obstetrical.
    2. obstetrician.
    3. obstetrics.
  2. off Broadway.
  3. opening of books.
  4. ordered back.


  1. he died; she died.

Origin of ob.

From the Latin word obiit



Origin of ob.

From the Latin word obiter


  1. oboe.
  2. Meteorology. observation.


  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 Neo-Latin and English scientific terms: object; obligate; oblanceolate.
Also o- oc-, of-, op-.

Origin of ob-

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


or O/B.

  1. opening of books.
  2. ordered back.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ob

Contemporary Examples of ob

Historical Examples of ob

  • Who ob all dis congregation is gwine next to lie ded-e-de-dah?

  • Tink, saar, ob David a-cuttin' off Goliah's head wid a pen, saar!

  • Yas, sar, allers; I nussed him, and den de chil'ren—all ob 'em.

    Among the Pines

    James R. Gilmore

  • She say dat South Callina does de most ob de fightin' 'n' de bes' ob it, too!

    The Long Roll

    Mary Johnston

  • Dey ced dey could wip two ob you, but I guess one ob you could wip two ob dem.

British Dictionary definitions for ob


  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)


abbreviation for British
  1. Old Boy
  2. outside broadcast


  1. inverse or inverselyobovate

Word Origin for ob-

from Old French, from Latin ob. In compound words of Latin origin, ob- (and oc-, of-, op-) indicates: to, towards (object); against (oppose); away from (obsolete); before (obstetric); down, over (obtect); for the sake of (obsecrate); and is used as an intensifier (oblong)


abbreviation for
  1. (on tombstones) obiit
  2. obiter
  3. oboe

Word Origin for ob.

(for sense 1) Latin: he (or she) died; (for sense 2) Latin: incidentally; in passing
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

Word Origin and History for ob


prefix meaning "toward, against, across, down," also used as an intensive, from Latin ob "toward, to, over against, in the way of, by reason of, about, before, in front of," from PIE root *epi, also *opi "near, against" (see epi-).

Online Etymology Dictionary, © 2010 Douglas Harper

ob in Medicine


  1. obstetrics
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.