mermaid

noun3

1. •
   A mythological creature with a woman's head and upper body, and a tail of a fish.

   • Search the depth, & see that variety of Sea monsters & fishes, Mare-maids, Sea men, Horses, &c. which it affords. — 1624
2. •
   Coloured a brilliant turquoise.
3. •
   (no longer used) A prostitute.