The Free On-line Dictionary of Computing (30 December 2018):

Flash Erasable Programmable Read-Only Memory
FEPROM
Flash EPROM
Flash ROM

    (FEPROM, "flash memory") A kind of non-volatile
   storage device similar to EEPROM, but where erasing can
   only be done in blocks or the entire chip.

   In 1995 this relatively new technology started to replace
   EPROMs because reprogramming could be done with the chip
   installed.  At that time FEPROMs could be rewritten about 1000
   times.

   Like EAPROM and ferro-magnetic material, FEPROMs rely on FN
   tunnelling.  Some flash memory supports block erase.

   (1995-04-22)