ῥίζαν [5 verses](noun sg fem acc) "Root" is rhiza, which means "root" and anything that springs from a root. It includes the roots of hairs, feathers, and teeth. It is also a metaphor for roots as a foundation, such as "the roots of the earth." -- "Root" is from the Greek word for a plant's "root" and anything that springs from a root. It includes the roots of hairs, feathers, and teeth. It is also a metaphor for roots as a foundation, such as "the roots of the earth."