from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Med. Presence of less than the normal amount of hair, or similarly fur
from The Century Dictionary and Cyclopedia
- n. Deficient growth of hair.
From the Greek hyp(o)-, (under), + tricho-, (combining form of thrix, meaning hair), + -osis, (state or condition) (Wiktionary)