As legal professionals we know that the technical legal language contains the essence of terms originated in Latin, due to law being institutionalized in Rome; however, a group of words exists that does not have their origins in Latin, but in Ancient Greek, whose knowledge is necessary to apply them to legal texts. By the means of a philological and historical analysis, it is possible to get deeper into etymology and trace the origin of the Greek term that law would incorporate within its vocabulary. This paper scientifically outlines the etymology, the definition, and current-day use of some words of Greek origin with the aim of motivating the reader, and particularly the lawyer, on their use for the noble causes of law (orabunt causas mellius).