Source : Webster's Revised Unabridged Dictionary (1913)

Radix \Ra"dix\, n.; pl. {Radices}, E. {Radixes}. [L. radix,
   -icis, root. See {Radish}.]
   1. (Philol.) A primitive, 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. [R.] --Hutton.

   3. (Bot.) The root of a plant.

Source : WordNet®

radix
     n : (numeration system) the positive integer that is equivalent
         to one in the next higher counting place; "10 is the
         radix of the decimal system" [syn: {base}]
     [also: {radices} (pl)]

Source : Free On-Line Dictionary of Computing

radix
     
         (Or "base", "number base") In a positional
        representation of numbers, that integer by which the
        significance of one digit place must be multiplied to give the
        significance of the next higher digit place.  Conventional
        decimal numbers are radix ten, {binary} numbers are radix two.
     
        (1995-12-24)