one of a pair of rollers between which wheat-grains are split.
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the world > food and drink > food > food manufacture and preparation > preparation of grain > milling or grinding > [noun] > cracker or roller
barley-cracker1808
corn-cracker1844
break-roll1910
1910 Encycl. Brit. X. 551/2 The first pair of break-rolls used to be called the splitting rolls, because their function was supposed to be to split the [wheat] berry longitudinally down its crease.