I. pronunc at idiot + pronunc at savant, or ēˌdyōsəˈväⁿ noun
( plural idiots savants -n(t)s, -äⁿ(z))
Etymology: French, literally, skilled idiot
: a person that is in general mentally defective but that displays unusual aptitude or brilliance in some special field
II. noun
: a person who knows almost everything about some specialty but almost nothing about anything else