root

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ROOT. That part of a tree or plant under ground from which it draws most of its nourishment from the earth.
     2. When the roots of a tree planted in one man's land extend into that of another, this circumstance does not give the latter any right to the tree, though such is the doctrine of the civil law; Dig. 41, 1, 7, 13; but such person has a right to cut off the roots up to his line. Rolle's R. 394, vide Tree.
     3. In a figurative sense, the term root is used to signify the person from whom one or more others are descended. Vide Descent; Per stirpes.

References in periodicals archive ?
Surgeons can implant motor roots at the area from which they are torn, and they will usually successfully reconnect, as motor neurons can regrow out of the spinal cord and into the motor root.
The nervus intermedius, which is smaller than the motor root of the facial nerve, passes into the brainstem between the acoustic nerve and the facial nerve motor root.
The larger sensory component arises from the ventrolateral aspect of the pons; the much smaller motor root emerges medially (Netter, 1995).