The word Raca is original to the Greek manuscript; however, it is not a Greek word. The most common view is that it is a reference to the Aramaic word reka, which literally means “empty one”, but probably meant “empty headed,” or "foolish.
In the bible what does the word RACA means ?
Jesus warns that the very act of murder finds its roots in an angry, murderous spirit: “But I tell you that anyone who is angry with his brother will be subject to judgment” (Matthew 5:22a). God, who examines the very thoughts and intents of the heart, will issue judgment upon unrighteous anger. Next, Jesus warns against name-calling, using “raca” as an example (verse 22b). Then He issues a third warning against those who call someone a “fool”
Matthew 5:22 (CEB) But I say to you that everyone who is angry with their brother or sister will be in danger of judgment. If they say to their brother or sister, ‘You idiot,’ they will be in danger of being condemned by the governing council. And if they say, ‘You fool,’ they will be in danger of fiery hell.
raca in British. (ˈrɑːkə) a biblical word meaning ‘worthless’ or ‘empty’