This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Alternative spelling of fertilize.

v. provide with fertilizers or add nutrients to

v. introduce semen into (a female)

v. make fertile or productive

"An expedition including British scientists that hoped to "fertilise" the ocean to combat global warming was last night ordered to stop because of concerns that the experiment could breach international law."

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fertilize