n An instrument with steel pins used to comb out flax or hemp. (defdate|from 15th c.)
n (usually|now|_|in the plural) One of the long, narrow feathers on the neck of birds, most noticeable on the cock. (defdate|from 15th c.)
n (fishing) A feather used to make a fishing lure or a fishing lure incorporating a feather. (defdate|from 17th c.)
n (usually|now|_|in the plural) By extension (because the hackles of a cock are lifted when it's angry), the hair on the nape of the neck in dogs and other animals; also used figuratively for humans. (defdate|from 19th c.)
n A plate with rows of pointed needles used to blend or straighten hair. (defdate|from 20th c.)