What is the scientific name for hair loss?

The general name is alopecia. It comes in several degrees:

• Androgenic alopecia or "male pattern baldness" (the most common form)
• Male and female pattern alopecia (androgenic alopecia, or androgenetic alopecia or alopecia androgenetica),
• Alopecia areata (the loss of some of the hair from the head)
• Alopecia totalis (the loss of all head hair)
• alopecia universalis (the loss of all hair from the head and the body)