The root is the part of the plant that's underground. Dig up a potato, and you will unearth its roots. Just pull them off before you cook the potato.
Root comes from the Latin word radix, which means "starting point," and you can think of the root of something as the place it starts from, whether that's the root of a tree, or the root of a problem. The root of your fear of swimming might have been a scary shark attack movie. If your ancestors come from Guatemala, you have Guatemalan roots. If you dig through a pile of junk, you're "rooting around."
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(botany) the usually underground organ that lacks buds or leaves or nodes; absorbs water and mineral salts; usually it anchors the plant to the ground
take root and begin to grow
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the place where something begins, where it springs into being
come into existence, originate
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a number that, when multiplied by itself some number of times, equals a given number
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dig with the snout
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