fertilization, fertilisation, fecundation, impregnation
Meaning: creation by the physical union of male and female gametes; of sperm and ova in an animal or pollen and ovule in a plant
Meaning: the process of totally saturating something with a substance; "the impregnation of wood with preservative"; "the saturation of cotton with ether"
Meaning: material with which something is impregnated; "the impregnation, whatever it was, had turned the rock blue"
This process is called fertilization, conception or impregnation.
It is certain that if they flew from one species to another, there would be a much greater mixture of different varieties than there now is, for they carry on their bodies the pollen or fertilizing principle, and thus aid most powerfully in the impregnation of plants.