American Tract Society Bible Dictionary
A word derived from a Hebrew word signifying vain, trifling, brainless; otherwise, beggarly, worthless. It is thus translated by the Vulgate, in Judges 11:3; in the English, "vain men." The word includes a strong idea of contempt. Christ says, Matthew 5:22 , whoever shall say to his brother, "Raca," shall be condemned by the council, or sanhedrim. The term translated "fool" in the same passage, means vile and abandoned wretch.
These files are public domain and are a derivative of the topics are from American Tract Society Bible Dictionary published in 1859.
Rand, W. W. Entry for 'Raca'. American Tract Society Bible Dictionary. https://www.studylight.org/dictionaries/eng/ats/r/raca.html. 1859.