A person who has had or who is capable of having children; a person who is focussed on the rearing of their own children.
A heterosexual; i.e. one whose sexual intercourse can lead to breeding.
A person who breeds plants or animals (professionally).
A pattern that exhibits quadratic growth by generating multiple copies of a secondary pattern, each of which then generates multiple copies of a tertiary pattern.
A fanatic, a person with an obsession.
An insane person, especially one who suffers from a mania.