A mentally challenged person who is very gifted in one area of activity, e.g. playing the piano, or mental arithmetic. This condition is associated with autism.

(idiomatic, chiefly US and Canada) Television.

A person who exhibits an extraordinary ability in one subject (often mathematics) whilst being intellectually disabled in many other domains.

(idiomatic, plural only) Mittens connected by yarn or string (idiot string (Canadian English)) running through one sleeve, along the back and out at the other sleeve of a coat, to prevent the mittens becoming lost. Generally worn by small children.

(automotive, slang) Any warning light or indicator on the dashboard of a car, designed to alert the driver to problems, such as the parking brake being on or the oil being low.

A person widely known in their community for their stupidity and ignorant behaviour.

plural of idiot board

(informal, humorous) Incapable of being misused even by the most stupid or careless of users.

To render something idiot-proof.

plural of idiot light