blue (blo͞o) n. 1. The hue of that portion of the visible spectrum lying between green and indigo, evoked in the human observer by radiant energy with wavelengths of. Blue green eyes are very rare. Learn more about blue green eyes and why people have them. Blue Green and other eye colors explored. Poll. This work is entirely fictional and does not in any way represent the activities of the persons described in it. A medium sized lady browsed .