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 the ideal combination, she maintains, three modes of the violin's front plate and two modes of its back plate vibrate in "octave frequencies" -- or as multiples of one root note. Hence, the phrase bi-tri octave tuning.
As Emily Ramshaw and Jay Root note in their write-up of the big to-do, "whether he was effective - or likeable - is, well, debatable."
Meanwhile, Alcoa (AA) has dropped 24% this year and if it gets cheap enough, maybe Arconic will decide it's time to consume its former parent company, Root notes. [Reference Link]:[https://www.barrons.com/articles/arconic-looks-to-unlock-value-in-a-potential-split-alcoa-may-get-left-behind-51565349302?mod=past_editions]
Bass guitar usually follows the root notes of the chords that the guitarist plays.