organic material bodily fluid material An organic material which is primarily composed of some natural bodily fluid or secretion such as blood, semen, saliva, blood plasma, intracellular and interstitial fluids. ENVO bodily fluid classes differ from UBERON's treatment of bodily fluids. UBERON refers to the substance itself ("S"). We assert that UBERON's classes are the primary compositional component of the terms in ENVO ("S material"). Use of the ENVO terms is typically recommended when you wish to indicate that there may be other materials intermixed with S. https://en.wikipedia.org/wiki/Bodily_fluid