Dictionary.com

Ob

[ awb, ob; Russian awp ]
/ ɔb, ɒb; Russian ɔp /

noun

a river in the W Russian Federation in Asia, flowing NW to the Gulf of Ob. 2,500 miles (4,025 km) long.
Gulf of, an inlet of the Arctic Ocean. About 500 miles (800 km) long.

QUIZZES

THIS PSAT VOCABULARY QUIZ IS PERFECT PRACTICE FOR THE REAL TEST

In our third teacher-created PSAT practice test there are new and unique vocabulary terms you may have never heard of! Can you guess what they mean?
Question 1 of 10
seclusion
a false belief or opinion.
the matter that settles to the bottom of a liquid.
the state of being isolated, kept apart, or withdrawn into solitude.
TAKE THE QUIZ TO FIND OUT

Definition for Ob (2 of 7)

OB

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

Definition for Ob (3 of 7)

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.
Also o- oc-, of-, op-.

Origin of ob-

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

Definition for Ob (4 of 7)

ob.1

he died; she died.

Origin of ob.

1
From the Latin word obiit

Definition for Ob (5 of 7)

ob.2

incidentally.

Origin of ob.

2
From the Latin word obiter

Definition for Ob (6 of 7)

ob.3

oboe.
Meteorology. observation.

Definition for Ob (7 of 7)

O.B.

or O/B.

opening of books.
ordered back.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021

British Dictionary definitions for Ob (1 of 4)

Ob
/ (Russian ɔpj) /

noun

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)

British Dictionary definitions for Ob (2 of 4)

OB

abbreviation for British

Old Boy
outside broadcast

British Dictionary definitions for Ob (3 of 4)

ob-

prefix

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)

British Dictionary definitions for Ob (4 of 4)

ob.

abbreviation for

(on tombstones) obiit
obiter
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

Medical definitions for Ob

OB

abbr.

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