Rex /reks/ noun British English
[Date: 1600-1700; Language: Latin; Origin: 'king']

1. a title used in official writing after the name of a king, when the king’s name has been written in Latin:
Henricus Rex (=King Henry)

2. law a word meaning the state, used in the names of law cases in Britain when a king is ruling ⇒ regina:
Rex v Jones

[TahlilGaran] Dictionary of Contemporary English ▲