flashcubes

/ˈflæʃˌkjubz/
noun
  1. A disposable cube-shaped unit containing four flashbulbs, used with older cameras to provide light for taking photographs.
    • My dad found an old box of flashcubes in the attic.
    • The flashcubes clicked and rotated after each photo was taken.
    • Before digital cameras, people used flashcubes to take pictures in the dark.
Synonyms
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