black box - definition and synonyms

noun [countable] 

Your browser doesn’t support HTML5 audio

singularblack box
pluralblack boxes
  1. 1
    a piece of equipment in a plane used for recording details about a flight, especially to try to find out the cause of a problem or crash
  2. 2
    informal a computer or similar piece of equipment that performs a complicated job, although the person using it does not understand how it works