gristPronunciation: /grɪst/Definition of grist noun [mass noun] 1corn that is ground to make flour. malt crushed to make mash for brewing. 2useful material, especially to support an argument:the research provided the most sensational grist for opponents of tobaccoPhrases grist to the (or one's) mill useful experience, material, or knowledge:all this free publicity was grist to his millOrigin: Old English 'grinding', of Germanic origin; related to grindgrist in other Oxford dictionaries Definition of grist in the US English dictionary