Physiognomy: The art of judging human character by facial features.

I know how to do this, actually.  Allow me to demonstrate.  You have a nose on the front of your face.  Ergo, you are the type of person who sniffs from the front of your face.

Physiognomy comes from the Greek φύσις (phusis), meaning physique, or appearance and the Greek γνώμων (gnomon), meaning someone that knows, an interpreter. 

Ultimately, γνώμων comes from the Greek verb γιγνώσκω (gignosko), I know. 

Want to know how to pronounce this word?  Click here.