Word used to define the slash pairing consisting of Merlin and Arthur Pendragon from the BBC TV Show "Merlin".
The relationship has been defined a "platonic love story" by the actor playing Mordred, Alexander Vlahos.
Julian Murphy, one of the four Co-Creators of Merlin, has practically made the pair canon in the last episode's commentary. This commentary was well welcomed by all the fangirls who shipped the two of them from the first episode.
Julian Murphy: We did very genuinely think of the episode as a love story between two men.
Julian Murphy: He’s dying… And the man he loves is dying, so he’s holding him.
Person #1: Just saw the last episode of Merlin and I'm full of Merthur feels!
Person #2: Me too! Merthur is totally canon!