Definition of pileous in US English:

pileous

adjective

Medicine
rare
  • Of, relating to, or consisting of hair.

Origin

Mid 19th century; earliest use found in Robley Dunglison (1798–1869), physician and medical writer. From classical Latin pilus hair + -eous, after osseous, carneous, etc.

Pronunciation

pileous

/ˈpʌɪlɪəs/