loach

noun4

1. •
   A bottom-feeding freshwater fish in the superfamily or suborder Cobitoidea.
2. •
   Any true loach, of the family Cobitidae.
3. •
   A similar fish in one of three other families of Cypriniformes: Botiidae, Balitoridae, and Gyrinocheilidae.
4. •
   (slang) Synonym of LOH (light observation helicopter)