Final answer:
Hirsutism is the term for the growth of an unusual amount of hair on parts of the body normally bearing only downy hair. It is characterized by excessive hair growth and can be caused by hormonal imbalances.
Step-by-step explanation:
The term for the growth of an unusual amount of hair on parts of the body normally bearing only downy hair is hirsutism. Hirsutism is characterized by excessive hair growth, particularly in areas such as the face, chest, back, and stomach. It is typically caused by an increase in androgen hormones, such as testosterone. Hirsutism can be a symptom of underlying medical conditions or can be idiopathic.