The hue of the long-wave end of the visible spectrum, evoked in the human observer by radiant energy with wavelengths of approximately 630 to 750 nanometers; any of a group of colors that may vary in lightness and saturation and whose hue resembles that of blood; one of the additive or light primaries; one of the psychological primary hues.
A pigment or dye having a red hue.
Something that has a red hue.
often Red A Communist.
A revolutionary activist.
often Red A Communist.
A revolutionary activist.
adj.
red·der, red·dest
Having a color resembling that of blood.
Reddish in color or having parts that are reddish in color: a red dog; a red oak.
Having a reddish or coppery skin color.
often RedOffensive Of or being a Native American.
Having a ruddy or flushed complexion: red with embarrassment.
often Red Communist.
[Middle English, from Old English rēad; see reudh- in Indo-European roots.] red'ly adv., red'ness n.
[red-nis] 
nɪs