bluecap

noun4

1. •
   A bird, the blue titmouse.

   • Mr. Hewitson mentions a pair of bluecaps having built their nest in a bottle[…] — 1869
2. •
   (informal) A Scotsman.
3. •
   A tiny blue-skinned fairy that inhabits a mine and helps the miners.
4. •
   A fish of the salmon kind with blue spots on its head.