aggresteyne
/ˈaɡrɪstiːn/(also aggrestyne) Falconry. rare. Now historical
noun
A form of pruritis affecting the tails of hawks, giving rise to self-mutilation.
Origin
Late 15th century; earliest use found in The Book of St. Albans. From post-classical Latin agrus sharp, acute + teen, after post-classical Latin agrus fumus pruritus in hawks.