ROOT n.
al leaf. See Radical, a., 3 (b). -- Root louse (Zoöl.), any plant louse, or aphid, which lives on the roots of plants, as the Phylloxera of the grapevine. See Phylloxera. -- Root of an equation (Alg.), that value which, substituted for the unknown quantity in an equation, satisfies the equation. -- Root of a nail (A…