If the BBC say it, it must be a word...

So, Thagomizer is a real word (episode 4) - meaning the spikey bit at the end of a Stegosaurid's tail. Named after the late Thag Simmons.


http://upload.wikimedia.org/wikipedia/en/6/65/Thagomizer.png


Let's see if anyone tries to kill us and work backwards