[ bahy-oh-uh-vey-luh-bil-i-tee ]
/ ˌbaɪ oʊ əˌveɪ ləˈbɪl ɪ ti /

noun Biochemistry.

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

Origin of bioavailability

First recorded in 1965–70; bio- + availability

Related forms

bi·o·a·vail·a·ble, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for bioavailability


/ (ˌbaɪəʊəˌveɪləˈbɪlɪtɪ) /


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 intravenousAlso called: systemic availability

Derived Forms

bioavailable, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medicine definitions for bioavailability


[ bī′ō-ə-vā′lə-bĭlĭ-tē ]


The physiological availability of a given amount of a drug, as distinct from its chemical potency.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.