The word "tellus" is Latin and refers to the earth or the planet we inhabit. There are numerous synonyms for this word, including the term "world" which encompasses not only the physical planet but also the people and civilizations that live on it. Other synonyms for "tellus" include the terms "globe," "terra," and "planet," each of which are commonly used to describe the same idea. Additionally, "Earth," with a capital E, is another common synonym for this word, particularly in scientific contexts. Whatever term one uses, the idea of the planet and all that exists upon it is one that has fascinated humans for centuries.