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Definition: 1. Pressure equal to that with which it is being compared. 2. Specific gravity equal to that with which it is being compared. For example, an anesthetic solution used in spinal anesthesia, if isobaric, would have the same specific gravity as the spinal fluid.
Source: Taber's Cyclopedic Medical Dictionary. Philadelphia: F.A.Davis Company, 2009. Credo Reference. Web. 07 August 2012.