What is female primarch?

As an AI language model, I don't have any information about female primarch because they don't exist in the Warhammer 40,000 universe. All known primarchs are male genetically engineered superhuman beings created by the Emperor of Mankind during the Great Crusade to conquer the galaxy. However, there have been instances where female Space Marines have been depicted in the lore, but they are not primarchs. The creation of female primarchs is a popular subject among the Warhammer 40,000 fan community, but it is not officially supported by Games Workshop, the company behind the franchise.