Curse, cobweb, witch, ghost, and even Halloween—all of these potentially spooky words have roots in Old English. Eldritch, although less common, is another, hailing from a time when otherworldly beings were commonly thought to inhabit the earth. The word dates back to the 16th century and may have its origin in the Middle English word elfriche, meaning “fairyland.” (The two components of elfriche—“elf” and “riche”—come from the Old English words ælf, “elf,” and rīce, “kingdom.”) Nowadays, eldritch is used to describe things that are eerie, weird, or frightful. You may also recognize the word as the name of the popular video game Eldritch, inspired by the stories of H.P. Lovecraft, who often used the word in his horror fiction. Or perhaps you've encountered it in the role-playing game Dungeons & Dragons.