There are 2 definitions of Ob in English:

Ob

Syllabification: Ob
Pronunciation: /äb, ôb
 
/
The principal river of the western Siberian lowlands and one of the largest rivers in Russia. Rising in the Altai Mountains, it flows north and west for 3,481 miles (5,410 km) before entering the Gulf of Ob (or Ob Bay), an inlet of the Kara Sea, a part of the Arctic Ocean.

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Word of the day wiseacre
Pronunciation: ˈwʌɪzeɪkə
noun
a know-all…

There are 2 definitions of Ob in English:

OB

Line breaks: OB

Entry from British & World English dictionary

abbreviation

British
Outside broadcast.

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