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.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in periodicals archive ?
In this context, we can see that each time the Root user tweets were retweeted (in gray), especially by users with significant quantities of followers, the number of new followers increased.
Root Explorer (File Manager) ($3.80): shows you the files you can now access as a root user; this is the second app a newly rooted phone needs on it.
The root user cannot change the password of kerberos users using 'kpasswd".
At this point you need to login as root user, which has no password.