bioavailability.

1. The proportion of an administered substance that reaches the body’s circulation in an available form.

2. The extent to which a substance in food, an environment, or a material is accessible for uptake or use by organisms.

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Words that belong together

• oral bioavailability
• a bioavailability estimate

On the page

The lower oral bioavailability explained why the two formulations were not interchangeable.

The estimate of bioavailability changed after the delivery system was revised.

Usage notes

Primary category: sci-fi. Forms: Usually uncountable. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.