The water-conducting tissue in plants, also known as wood or xylem, that transports water and minerals upward from roots.
From Greek hadro- (meaning 'thick' or 'bulky') and -om (tissue), referring to the thick woody tissue. It's a technical botanical term coined in the 19th century.
Plants created their own plumbing system with hadrom—it's made of dead cells that create an unbroken pipeline, which is why you can split a plant stem and still see water travel up it.
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