Definify.com
Webster 1913 Edition
Fertilizer
Fer′ti-lizer
,Noun.
1.
One who fertilizes; the agent that carries the fertilizing principle, as a moth to an orchid.
A. R. Wallace.
2.
That which renders fertile; a general name for commercial substances which make plants grow better, as manure, guano, phosphate of lime, ammonium nitrate, etc.