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microfloppy

noun
mi·​cro·​floppy | \"+\
variants: or microfloppy disk

Definition of microfloppy 

: a floppy disk smaller than 5¹/₄ inches in diameter

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First Known Use of microfloppy

1977, in the meaning defined above

History and Etymology for microfloppy

micr- + floppy

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The first known use of microfloppy was in 1977

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