Marked with a grain or grain-like pattern; having a texture resembling grains or wood grain.
Past participle of 'grain' as a verb, meaning to mark with a grain pattern, plus the adjectival suffix to describe something characterized by grains or grain-like appearance.
Wood finishers have used 'graining' techniques for centuries to fake expensive wood grain on cheap wood—it's an art form that requires serious skill to fool the eye.
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