noun Biochemistry.
the extent to which a nutrient or medication can be used by the body.

1965–70; bio- + availability

bioavailable, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
bioavailability (ˌbaɪəʊəˌveɪləˈbɪlɪtɪ)
Also called: systemic availability the extent to which a drug or other substance is taken up by a specific tissue or organ after administration; the proportion of the dose of a drug that reaches the systemic circulation intact after administration by a route other than intravenous

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American Heritage
Medical Dictionary

bioavailability bi·o·a·vail·a·bil·i·ty (bī'ō-ə-vā'lə-bĭl'ĭ-tē)
The physiological availability of a given amount of a drug, as distinct from its chemical potency.

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