From Longman Dictionary of Contemporary EnglishRexRex /reks/ noun British English 1 PGONAME OF A PERSONa 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 lawSCT a word meaning the state, used in the names of law cases in Britain when a king is ruling → regina Rex v Jones
Examples from the Corpus
Rex• The first thing you noticed about Rex was his bushy red beard.• We had all gathered to eat a meal cooked by Rex.• Celebrate in desert elegance, the historic Rex Ranch offers a variety of options.• For a moment Rex and I gaped, and then Rex dived into the cabin to fetch his camera.• I was fond of Diana, as I was of Rex.• The Phoenix is for rockers, the Rex for writers.• Trondur soon simmered down, and with Rex he went to refasten the cabins, using the last of the good rope.Origin Rex (1600-1700) Latin “king” 