- The definition of biodegradable is something that can decompose or break down naturally by microbial action.
An example of biodegradable is vegetable scraps.
This pile of kitchen scraps is biodegradable.
Origin of biodegradablebio- + degrad(e) + -able
(comparative more biodegradable, superlative most biodegradable)
- Capable of being decomposed by biological activity, especially by microorganisms.
- Any material that can be decomposed by biological activity.