Ob
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.
Other definitions for OB (2 of 7)
Also ob Medicine/Medical.
off Broadway.
opening of books.
ordered back.
Other definitions for ob- (3 of 7)
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.
Origin of ob-
3Other definitions for ob. (4 of 7)
he died; she died.
Origin of ob.
4Other definitions for ob. (5 of 7)
incidentally.
Origin of ob.
5Other definitions for ob. (6 of 7)
oboe.
Meteorology. observation.
Other definitions for O.B. (7 of 7)
opening of books.
ordered back.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use Ob in a sentence
In an ad called “Spelling Bee,” a young child spells “Pryor” as “O-B-A-M-A,” to which the judge says, “Close enough.”
Thus, in Figure 184, draw the line O B, and divide it into inches and parts of an inch.
Mechanical Drawing Self-Taught | Joshua RoseHad he found the true O. B., only to behold another and final seal fall upon this closely folded mystery?
Initials Only | Anna Katharine GreenOne time, while in the country, she met a sporting man, Mr. O. B.
The Autobiography of a Thief | Hutchins HapgoodLet o b be tangent at o to the arc o d, of which c is the centre.
Modern Machine-Shop Practice, Volumes I and II | Joshua Rose
Snuffles and dabs her eyes and says: 'If I go back without any photograph, I'll lose my j-o-o-o-b!
The Bacillus of Beauty | Harriet Stark
British Dictionary definitions for Ob (1 of 4)
/ (Russian ɔpj) /
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)
Old Boy
outside broadcast
British Dictionary definitions for ob- (3 of 4)
inverse or inversely: obovate
Origin of ob-
3British Dictionary definitions for ob. (4 of 4)
(on tombstones) obiit
obiter
oboe
Origin of ob.
4Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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