cret ‧ in /ˈkretən, ˈkretɪn $ ˈkriːtn/ BrE AmE noun [countable]
[ Date: 1700-1800 ; Language: French ; Origin: crétin , from French dialect cretin 'Christian, human being, type of mentally affected person who lives in the Alps' , from Latin christianus 'Christian' ]
informal an offensive word for someone who is extremely stupid