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In brief: Water. Free fluid is typically water. The lining of your abdominal contents are slippery (your bowel, the lining of your organs) and it's thus wet inside your abdomen. It's normal to have a little free fluid in one's pelvis, as that's where fluid tends to pool.
transcellular fluids. Definitions: 1. the fluids that are not inside cells, but are separated from plasma and interstitial fluid by cellular barriers; cerebrospinal fluid, synovial fluid, pleural fluid.The definition information for transcellular fluids is provided by Stedman's. You can search our medical dictionary here.. the fluids that are not inside cells, but are separated from plasma and interstitial fluid by cellular barriers; cerebrospinal fluid, synovial fluid, pleural fluid.