biodegrade

[bahy-oh-di-greyd]
verb (used without object), biodegraded, biodegrading.
to decay and become absorbed by the environment: toys that will biodegrade when they're discarded.

Origin:
1970–75; back formation from biodegradable

biodegradation [bahy-oh-deg-ruh-dey-shuhn] , noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
It's standard technique to break up a slick in ocean environments and allow
  them to biodegrade more quickly.
Most other materials biodegrade or are not as buoyant as plastics, which do not
  biodegrade.
However, it's unknown how-or even if-dispersants applied at depths biodegrade
  in the same way that they do at the surface.
And they never really biodegrade: they simply break into ever smaller pieces.
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