Princeton's WordNet

1. Ob, Ob River(noun)

   a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea

2. obstetrics, OB, tocology, midwifery(noun)

   the branch of medicine dealing with childbirth and care of the mother

Wiktionary

1. Ob(Symbol)

   The set of objects of a category.

2. Ob(ProperNoun)

   A major river in western Siberia, Russia.

Origin: From ob, abbreviation of obulus.

The New Hacker's Dictionary

1. Ob

   Obligatory. A piece of netiquette acknowledging that the author has been straying from the newsgroup's charter topic. For example, if a posting in alt.sex is a response to a part of someone else's posting that has nothing particularly to do with sex, the author may append ‘ObSex’ (or ‘Obsex’) and toss off a question or vignette about some unusual erotic act. It is considered a sign of great winnitude when one's Obs are more interesting than other people's whole postings.

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