bi·o·de·grad·a·ble

[bahy-oh-di-grey-duh-buhl]
adjective
capable of decaying through the action of living organisms: biodegradable paper; biodegradable detergent.

Origin:
1960–65; bio- + degrade + -able

bi·o·de·grad·a·bil·i·ty, noun
non·bi·o·de·grad·a·ble, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
biodegradable (ˌbaɪəʊdɪˈɡreɪdəbəl) [Click for IPA pronunciation guide]
 
adj
(of sewage constituents, packaging material, etc) capable of being decomposed by bacteria or other biological means
 
biodegradation
 
n
 
biodegradability
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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00:10
Biodegradable has a plethora of syllables.
So is pneumonoultramicroscopicsilicovolcanoconiosis. Does it mean:
(used as a nonsense word by children to express approval or to represent the longest word in English.)
an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language.
Etymonline
Word Origin & History

biodegradable
1960, from bio- + degrade + -able.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

biodegradable bi·o·de·grad·a·ble (bī'ō-dĭ-grā'də-bəl)
adj.
Capable of being decomposed by biological agents, especially bacteria.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
biodegradable   (bī'ō-dĭ-grā'də-bəl)  Pronunciation Key 
Capable of being decomposed by the action of biological agents, especially bacteria.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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American Heritage
Cultural Dictionary
biodegradable [(beye-oh-di-gray-duh-buhl)]

Material that, left to itself, will be decomposed by natural processes.

Note: The use of biodegradable packaging is supposed to reduce the volume of waste in landfills.
The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
Green bedding products are manufactured without environmentally harmful
  chemicals and they are dyed with biodegradable pigments.
Rinse the drum with soap and water or a biodegradable cleaner.
Never pour any chemicals down the drain, and try to use natural, biodegradable
  products.
There they ate dinner on biodegradable plates and took turns giving brief
  speeches.
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