A related term, rakshasa, means "demon" in Sanskrit; and in Hindu mythology, rakshasa were demonic creatures that had a thirst for blood and ate human flesh. They are said to have been created from Brahma's breath while he was sleeping and immediately started eating the god. To protect himself, Brahma screamed "Rakshama!," meaning "Protect me!" Lord Vishnu came to help him and banished all the rakshasa.
One of the most famous of the rakshasa was Ravana, a 10-headed demon from the epic poem, "Ramayana."