bioavailability
UK[ˌbaɪəʊəˌveɪləˈbɪləti]US[ˌbaɪoʊəˌveɪləˈbɪləti]
n
The proportion of a drug or other substance which enters the circulation when introduced into the body and so is able to have an active effect.
n
The degree and rate at which a substance (such as a nutrient) is absorbed and becomes available to the target tissue.
Morpheme Breakdown
bio
avail
ability
bio
life
avail
available
ability
quality of
Etymology
The term 'bioavailability' is a modern scientific compound, constructed in the mid-20th century from established English morphemes. Its first element, 'bio-', draws from the Greek word for 'life', anchoring the term in the context of biological systems. The core, 'avail', originates from the Latin verb valere, meaning 'to be strong or effective', which evolved through Old French into the English word 'available', signifying something that is accessible and ready for use. The suffix '-ability', also of Latin origin, transforms the concept into a measurable state or quality. Thus, the word's literal logic—'the quality of being available to life (or a living system)'—perfectly encapsulates its technical meaning: the extent to which an administered substance becomes effectively accessible for physiological activity.
Analysis
Structure: bio (life) + avail (available) + ability (quality of)
- bio: From Greek bios (life). In this word, it functions as a combining form meaning 'life' or 'living organisms'.
- avail: From Latin valere (to be strong, be worth). In this word, it is a direct substring of 'available', meaning 'able to be used or obtained'.
- ability: From Latin -abilitas, a suffix forming nouns indicating a quality or state. In this word, it denotes the 'quality or state of being'.
Examples
The bioavailability of this medication is significantly higher when taken with food.
Scientists are studying ways to enhance the bioavailability of nutrients in plant-based diets.
The generic drug must demonstrate bioequivalence, meaning it has a similar rate and extent of bioavailability as the brand-name product.