Bio degrade

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
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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WordNet
biodegrade

verb
break down naturally through the action of biological agents; "Plastic bottles do not biodegrade" 
WordNet® 3.0, © 2006 by Princeton University.
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