fertilizer

[fur-tl-ahy-zer]
noun
1.
any substance used to fertilize the soil, especially a commercial or chemical manure.
2.
a person, insect, etc., that fertilizes an animal or plant: Bees are fertilizers of flowers.

Origin:
1655–65; fertilize + -er1

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Collins
World English Dictionary
fertilizer or fertiliser (ˈfɜːtɪˌlaɪzə)
 
n
1.  any substance, such as manure or a mixture of nitrates, added to soil or water to increase its productivity
2.  an object or organism such as an insect that fertilizes an animal or plant
 
fertiliser or fertiliser
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
fertilizer   (fûr'tl-ī'zər)  Pronunciation Key 
Any of a large number of natural and synthetic materials, including manure and compounds containing nitrogen, phosphorus, and potassium, spread on or worked into soil to increase its capacity to support plant growth. Synthetic fertilizers can greatly increase the productivity of soil but have high energy costs, since fossil fuels are required as a source of hydrogen, which is necessary to fix nitrogen in ammonia.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Only a small fraction of natural gas goes into fertilizer production.
These crops are measurably increasing yields while reducing the demand for
  fertilizer, pesticides, and water.
They cost the same as a lawnmower and they'll even throw in their special blend
  of self-produced fertilizer.
Our fathers used to say that the master's eye was the best fertilizer.
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