The word red is derived from the Old English rēad.
The word can be further traced to the Proto-Germanic rauthaz and the Proto-Indo European root rewdʰ-. In Sanskrit, the word rudhira means red or blood. In the Akkadian language of Ancient Mesopotamia and in the modern Inuit language of Inuit, the word for red is the same word as "like blood".
n the Russian language, the word for red, Кра́сный (krasniy), comes from the same old Slavic root as the words for "beautiful"—красивый (krasiviy) and "excellent"—прекрасный (prekrasniy). Thus Red Square in Moscow, named long before the Russian Revolution, meant simply "Beautiful Square".
In heraldry, the word gules is used for red.