English Proper noun CFlash (photography) Abbreviation of CompactFlash: a flash memory format, the predecessor to the CompactFast format, using the same physical form factor, but with the older IDE interface instead of SATA. Synonym: CF Noun CFlash (plural CFlashes) (photography) A CompactFlash memory card Synonym: CFWikiwand - on Seamless Wikipedia browsing. On steroids.