Misplaced in Time?

I've been rereading Diana Gabaldon's Outlander series (because I'm a longtime fan and because it's finally made it to the small screen—thank you, Ron Moore!). For full disclosure, I should admit that I'm also listening to the audiobooks when riding in my spouse's car. While listening to Dragonfly in Amber, my spouse heard the word "zombie," paused the CD, and exclaimed, "Whoa! They had zombies in the 1700s? No way. I think Diana messed up." Since the scene takes place in the 1740s, the word zombie seemed misplaced. I stopped to ponder: Did people in Scotland at that time know [...]