truar

By analogy to the word liar for one who lies.

truar (plural truars)

1. One who always tells the truth.
   • 1980, David H. Ahl, Computers in Mathematics: A Sourcebook of Ideas, page 42:

     The third person is either an Anania (liar) or a Diogene (truar).

   • 2012, Wayne A. Wickelgren, How to Solve Mathematical Problems, →ISBN:

     From this information, can you determine how many of the three are liars and how many are truars?

   • 2013 -, David Gries, Fred B. Schneider, A Logical Approach to Discrete Math, →ISBN, page 106:

     The country of Marr is inhabited by two types of people: liars always lie and truars always tell the truth —sounds like a knight-knave problem, eh?

This term is used almost exclusively for logic puzzles.

• turra

From Latin trahere, present active infinitive of trahō (“I pull”).

truar

1. to throw