Rā'dix, n.

n. [Lat. radix, radicis, root; It. radice, Sp. & Pg. raiz, O. Fr. rais, Pr. raditz, razitz, raitz.]

1. (Philology.) A primitive word, from which spring other words; a radical; a root; an etymon.
2. (Math.) (a.) A number or quantity which is arbitrarily made; the fundamental number of any system; a base. Thus, 10 is the radix, or base, of the common system of logarithms, and also of the decimal system of numeration. (b.) (Alg.) A finite expression, from which a series is derived. [Rare.] Hutton.
3. (Bot.) The root of a plant.