Okay kiddo, so Tremédica is a big word that means something makes you really scared or nervous. Like when you're about to do a big test you haven't studied for, or when you see a spider and you're afraid it's going to crawl on you. It's a feeling that makes your hands shake and your heart race. Just like when you're on a rollercoaster, but instead of being fun, it's scary. Does that make sense?