Blueback

Part of speech: noun

Definitions

1. A descriptor for various fish that exhibit a blue upper body
2. This term can also indicate a type of heron known for its blue plumage, typically residing in coastal environments
3. A name for certain fish species characterized by having a blue-colored back ; a species of heron recognized for its blue feathers and habitation near shores

Etymology: "Blueback" is a plain compound of "blue" and "back," describing a fish, and in its name the colour of the upper body does the work. The word is a straightforward combination of two common English words, with no borrowing or sound change involved: the "blue" refers to the dorsal colouring, and "back" to the upper surface of the fish. Many fish carry the name in different parts of the world, so the same descriptive logic has been applied to a range of unrelated species, each named for the blue hue along its top.