They stopped arguing when my wife exclaimed, "it's Greek!"

A few years ago I was on a train in London when a very weird Greek-thing happened. On the seats across from my wife and I was a family trying to answer a crossword puzzle. It wasn't going well... They were getting rowdy about a word. It had something to do with ancient language, but the origin of the word was in question. The word "grapho," was thrown around with varying degrees of distress. It finally caught my wife Ruby's attention. She looked at them for a second, then exclaimed "it's...