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Definition of radix : 1. A finite expression, from which a series is derived.
2. 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.
3. A primitive word, from which spring other words; a radical; a root; an etymon.
4. The root of a plant.

Synonyms:

floor, nucleotide, substructure, root word, understructure, cornerstone, bag, home, stem, al-Qa'ida, theme, foundation, infrastructure, foot, al-Qaida, pedestal, base of operations, stand, groundwork, basis, fundament, base, alkali, al-Qaeda, radical

fraction, algorithm, index, differential calculus, dividend, reciprocal, multiplier, multiple, root, algebra, trigonometry, arithmetic, denominator, quotient, coefficient, square root, cube, integral, power, antilogarithm, logarithm, calculus, multiplicator, divisor, subtrahend, formula, geometry, exponent, quadratics, factor, multiplicand, cube root, minuend, numerator, modulus, increment

Usage examples:

• The laxative properties of the Mallow, both as regards its emollient leaves, and its radix altheoe efficacior, were told of by Cicero and Horace. - "Herbal Simples Approved for Modern Uses of Cure", William Thomas Fernie.
• 2. 5. Radix vetust. - "The Roman Poets of the Augustan Age: Virgil", W. Y. Sellar.