Blue-green is the color between blue and green. It belongs to the cyan family.
Cyan is the blue-green color that is between blue and green on a modern RGB color wheel.
The modern RGB color wheel replaced the traditional old-fashioned RYB color wheel because it is possible to display much brighter and more saturated colors using the primary and secondary colors of the RGB color wheel. In the terminology of color theory, RGB color space has a much larger color gamut than RYB color space.
The first recorded use of cyan as a color name in English was in 1879.
The color turquoise is that of the semi-precious stone turquoise, which is a light tone of blue-green.
Its first recorded use as a color name in English is from 1573.
Green-blue is a Crayola crayon color from 1958 to 1990.
Bondi blue belongs to the cyan family of blues. It is very similar to the Crayola crayon color "blue-green".
Apple, Inc. designated the name "Bondi Blue" to the color of the original iMac's back cover when it was introduced in 1998. It is said to be named for the color of the water at Bondi Beach, in Sydney, Australia.
One definition of the color is in the Munsell color system (Munsell 5BG) although there is widespread acceptance and knowledge of the color from the so-called blue-green algae which have been recognised and described since the 18th century and probably before that.