Palmer \Palm"er\, n. 1. (Zo["o]l.) A palmerworm. 2. (Angling) Short for {Palmer fly}, an artificial fly made to imitate a hairy caterpillar; a hackle. Palmer \Palm"er\, n. 1. (Zo["o]l.) A palmerworm. [Webster 1913 Suppl.] 2. (Angling) Short for {Palmer fly}, an artificial fly made to imitate a hairy caterpillar; a hackle. [Webster 1913 Suppl.]