It is the origin of many words in English and other languages related to horses, such as:
* Cavalry: Soldiers who ride horses
* Cabal: A secret group of people (originally, a group of people involved in horse trading)
* Caballeriza: A stable for horses (Spanish)
* Cavalier: A gentleman, a knight (originally, a horseman)
Knowing the root word caballus can help you understand the meaning of many related words.