Grain is the small hard seed of plants like wheat, rice, or corn that people and animals eat. It can also mean a tiny piece of something or the natural lines in wood or other materials.
“Grain” comes from Latin “granum,” meaning seed or kernel. The word has long been linked to basic food crops and tiny particles.
The phrase “grain of truth” suggests that truth can be as small and hard to spot as a single seed in a field. Woodworkers say ‘with the grain’ or ‘against the grain’ to describe working with or against natural patterns—an idea we now use for human behavior too.
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