A newer word for discrimination or predjudice against people based on their physical appearence and gender exspectations. Lookism discriminates against both "beautiful" and "ugly" people, as it is predjudice against a person for the way they look, positively and negatively.
Also the preconcived notions or stereotypes on a person because of how they look, or their gender.
"Beautiful woman will be paid more then less attractive woman in the work place beause of their appearence." -that is lookism.