Fertilized

Pregnancy only happens if the ovum is fertilized.

In short it was only after many failures, and after many barren epochs during which, for a variety of reasons, the enterprise was neglected, that the Fourth Men did at length fashion two individuals almost precisely of the type they had originally designed. These were produced from a single fertilized ovum, in laboratory conditions. Identical twins, but of opposite sexes, they became the Adam and Eve of a new and glorious human species, the Fifth Men.

This hen is sitting on an egg, but the egg won't hatch because it has not been fertilized.

Some twins develop from two separate eggs that are fertilized at the same time. These babies are called fraternal twins. One can be a girl and the other a boy.

Some of them also won't dispense other contraceptives if there is even a remote chance that the medications could act to kill a fertilized egg.

Benedito fertilized the plant.

Fertilized roundworm eggs are deposited in the soil from human feces. If someone ingests these eggs, they hatch in the intestine.

Tom fertilized some of his fields.