flashcard

or flash card

[flash-kahrd]
noun
  1. a card having words, numerals, or pictures on it, designed for gaining a rapid response from pupils when held up briefly by a teacher, used especially in reading, arithmetic, or vocabulary drills.

Origin of flashcard

First recorded in 1920–25; flash + card1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018