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1 definition found

From: WordNet (r) 2.0

 Ob
      n 1: a major river of western Siberia; flows generally northward
           and westward to the Gulf of Ob and the Kara Sea [syn: Ob
           River]
      2: the branch of medicine dealing with childbirth and care of
         the mother [syn: obstetrics, tocology, midwifery]