Vocabulary: regicide: a person
Self-tutoring about English: the tutor mentions a meaning of regicide he didn’t know.
Regicide can be the murder of a king, but it can also mean the murderer of a king. If Caesar had been a king, Brutus, Cassius, and the other conspirators would have been regicides.
Source:
Mish, Frederick C (editor). Merriam-Webster Dictionary. Springfield: Merriam-Webster, 2004.
Jack of Oracle Tutoring by Jack and Diane, Campbell River, BC.