The 12-book Micropædia is one of the three parts of the 15th edition of Encyclopædia Britannica, and the other two being the one-book Propædia and the 17-book Macropædia. The name comes from the word "micro" and "encyclopaedia". Micro means small and so, the Micropaedia is a small encyclopedia. The Micropaedia has articles that are very short, the articles are found in small strips. It is the opposite of the Macropaedia, which has articles that are very long.