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root (rōōt, rut)
The embedded part of an organ or structure, such as a hair, tooth, or nerve, serving as a base or support.
A primary source; an origin; radix.
In biology, the part of a plant that grows downward and holds the plant in place, absorbs water and minerals from the soil, and often stores food. The main root of a plant is called the primary root; others are called secondary roots. The hard tip is called the root cap, which protects the growing cells behind it. Root hairs increase the root's absorbing surface.
The part of a tooth below the gum. The root anchors the tooth to the jawbone.
[1846+; fr something that is or can be planted]
[1888+; origin obscure]
[perhaps fr cheroot or cigaroot]