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- DictionaryBut·tress root
noun
- 1. a tree root whose upper, exposed parts project from the trunk like a buttress.
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noun
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Buttress roots, also known as plank roots, are large, wide roots on all sides of a shallowly rooted tree. Typically, they are found in nutrient-poor tropical forest soils that may not be very deep. They may prevent the tree from falling over (hence the name buttress). Wikipedia