Taurine is an adjective that refers to a bull. 

The Latin word taurus (TAR oos) means bull. By adding the suffix INE, our word of the day turns taurus into an adjective to describe behavior that is stubborn like a bull. Here’s an example:

Shelly’s taurine demeanor can take a while to get used to. But once you accept that you’re never going to win an argument with her, you can get along with her pretty well.