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ob

 
Noun ob has 2 senses
  1. Ob, Ob River - a major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea
    --1 is a kind of river
    --1 is a part of Siberia
  2. obstetrics, OB, tocology, midwifery - the branch of medicine dealing with childbirth and care of the mother
    --2 is a kind of medicine, medical specialty
    --2 has particulars: fetology, foetology; perinatology
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