Where does “heightism” come from?

heightism (English) comes from English height, from Middle English heighte, from Old English hēahþu, from Proto-Germanic hauhiþō, from Proto-Germanic hauhaz, from Proto-Indo-European ḱewk- — flare up, glow; white; to glow, burn, lighten.

heightism (English): A prejudiced attitude about human height that...