World English Dictionary
fertilizer or fertiliser (ˈfɜːtɪˌlaɪzə)
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

Collins English Dictionary - Complete & Unabridged 10th Edition
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