A measure of how much a substance can be metabolized and used by an organism. For example, your body needs iron. But a musket ball isn't a particularly good vitamin, because your digestive system can't pull it apart and transport the iron molecules into your blood. It isn't bioavailable.
From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.
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