Any of a range of colours having the longest wavelengths, 670 nm, of the visible spectrum; a primary additive colour for transmitted light: the colour obtained by subtracting green and blue from white light using magenta and yellow filters; the colour of blood, ripe strawberries, etc.
"The research team at Kyoto University developed a new RED stack that generates electricity from salinity differences between river water and seawater."
A Communist.
Acronym of reverse electrodialysis.
In plain English: Red is the color that looks like fire, blood, or a ripe apple.
"The red caught my eye immediately on the shelf."
Usage: Use "red" as a noun to describe the specific color itself or metaphorically for things like political parties (the Reds) or financial loss (in the red). Avoid confusing it with adjectives describing objects unless you are specifically referring to the hue in an artistic context, such as mixing pigments.
simple past tense and past participle of rede
"The old weather vane had rusted into a deep red over the years."
Alternative spelling of redd
In plain English: To red means to make something look redder, but it is rarely used this way and people almost never say it.
"Red my face when I realized I had made a mistake in front of everyone."
Having red as its color.
"The new leader was accused of being too red after he pushed for stricter state control over private businesses."
Communist
In plain English: Red is the color you see when something looks like a ripe stop sign or an apple.
"The traffic light turned red to stop the cars."
A nickname given to someone who has or had red hair.
"Everyone at the party knew that Red was actually a big fan of spicy food, even though he didn't have much left on his head these days."
The word "red" comes from Old English and shares a common ancestor with similar words in other Germanic languages. It has been used to describe the color since ancient times, traveling directly into Middle English without a significant shift in meaning.