In horticulture, the process or technique of grafting plants; the result of grafting one plant onto another.
From 'graft' (the horticultural practice of joining plant parts) with the suffix '-age' indicating a process or collection. The horticultural sense comes from Old Norse 'grapt,' meaning to dig or carve.
Graftage is how we get fruit trees—a peach is often the 'graft' attached to a hardier plum root—and this centuries-old technique inspired our metaphorical use of 'graft' for corruption, since it originally meant implanting something foreign into something else.
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