root

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Related to motor root: motor root of trigeminal nerve, root signature, bifurcated root, sensory root of spinal nerve
See: basis, bloodline, cause, derivation, determinant, embed, establish, reason

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 ?
These patients are not good candidates for nerve transfer due to the loss of the lower motor roots typically used for transfer.