An illness or disease that affects grain crops, causing them to wither or fail to grow properly.
From Middle English 'grain' (cereal crop) + 'sickness' (disease). The compound emerged in agricultural English to describe crop diseases that plagued farmers, particularly fungal infections or blight that devastated grain harvests.
Before modern fungicides, grainsickness could wipe out entire harvests and cause famines—which is why grain storage and preservation techniques became crucial to human civilization's survival.
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