idiot savant[id′ē ət sa vänt′, -vant′; sav′ənt; Fr ē dyō sȧ vän′]
a mentally retarded person who possesses some remarkable special aptitude, as for memorization or rapid mental calculation
Origin of idiot savantFrench literally , wise idiot
nounpl. idiot savants idiot savants
A person with a cognitive or developmental impairment, such as mental retardation or autism, who exhibits extraordinary ability in a highly specialized area, such as arithmetic or memorization.
Origin of idiot savantFrench : idiot, idiot + savant, learned.
(plural idiot savants)