Hue

Etymology

From Old English "hīw" or "hēow" (form, appearance, color), a native Germanic word with cognates in Old Norse and Gothic. It once meant appearance broadly, then narrowed to the color aspect specifically. The phrase "hue and cry" contains a different, unrelated word.

noun · /HYOO/
The pure attribute of a color that gives it its name — red, green, blue — apart from how light or vivid it is.
What it names
It isolates one of the three dimensions of color so you can talk about which color something is separately from how intense or bright it is.
Example
Both walls are the same blue hue; the second just looks paler because it is less saturated.
Related idea
Hue is which color it is; saturation is how intense or washed-out that color is; a pale pink and a fire-engine red can share the same hue at different saturations. Hue names the color; saturation measures its vividness.