Ob > define
noun
- A major river of western Siberia; flows generally northward and westward to the Gulf of Ob and the Kara Sea.
- synonyms: Ob River
- The branch of medicine dealing with childbirth and care of the mother.
- synonyms: obstetrics, tocology, midwifery
by WordNet 3.0 © 2006 by Princeton University
(Military) OB stands for one of the following: operating base; order of battle
by Department of Defense Dictionary of Military and Associated Terms. 31 January 2011.