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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 ?
Caption: Figure 1: The long axis of the upper first molar was constructed from the apex of mesiobuccal root of the first molar and its mesiobuccal cusp using the software.
The details of human tooth morphology were published by GV Black in 1902.3 Each human tooth has its unique roots anatomy and has been studied in details.1 For example, mesiobuccal root of maxillary 1st molar has been reported to have two distinct canals since 1925.4
Hartwell & Bellizi (1982) reported the incidence of additional canals in the mesiobuccal root as being between 40 % and 95 %.
A micro-computed tomography study of canal configuration of multiple-canalled mesiobuccal root of maxillary first molar.
This article presents a successful case of endodontic-periodontal combined lesion with a retained instrument fragment in maxillary molar managed with mesiobuccal root resection and guided tissue regeneration (GTR).
In other words, it is more appropriate and more clinically relevant to report holistically the percentage of three rooted maxillary first molars with a Vertucci type 2-1 in the mesiobuccal root and type 1 canals in the distal and palatal roots, respectively, than presenting only the percentage of type 2-1 canals in the mesiobuccal root separately from the other roots (Table 1).
1 Weine FS, Healey HJ, Gerstein H, Evanson L: Canal configuration in the mesiobuccal root of the maxillary first molar and its endodontic significance.
Study of the areas and thicknesses of mesiobuccal root canals prepared by three endodontic techniques.
The detection rate of the mesiobuccal root of maxillary first molars has the greatest anatomic variation, leading to a high rate of unsuccessful endodontic treatment in these teeth (Stropko; Yoshioka di al., 2005; Grande et al.).