[rey-diks]
1.
Mathematics. a number taken as the base of a system of numbers, logarithms, or the like.
2.

Origin:
1565–75; < Latin rādīx root (cf. race3, radical, ramus); akin to Greek rhíza root, rhā́dīx branch, frond; see root1

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World English Dictionary
 radix (ˈreɪdɪks) —n , pl -dices, -dixes 1. maths any number that is the base of a number system or of a system of logarithms: 10 is the radix of the decimal system 2. biology the root or point of origin of a part or organ 3. linguistics a less common word for root [C16: from Latin rādīx root; compare Greek rhadix small branch, rhiza root]

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Medical Dictionary

n. pl. ra·dix·es or rad·i·ces (rād'ĭ-sēz', rā'dĭ-)
The primary or beginning portion of a part or organ, as of a nerve at its origin from the brainstem or spinal cord.

The American Heritage® Stedman's Medical Dictionary
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Science Dictionary
 radix   (rā'dĭks)  Pronunciation Key  Plural radices (rād'ĭ-sēz', rā'dĭ-) or radixes Biology The primary or beginning portion of a part or organ, as of a nerve at its origin from the brainstem or spinal cord. Mathematics The base of a system of numbers, such as 2 in the binary system and 10 in the decimal system.
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FOLDOC
Computing Dictionary

mathematics
The ratio, R, between the weights of adjacent digits in positional representation of numbers. The right-most digit has weight one, the digit to its left has weight R, the next R^2, R^3, etc. The radix also determines the set of digits which is zero to R-1. E.g. decimal (radix ten) uses 0-9 and each digit is worth ten times as much as you move left along the number.
(2006-11-10)

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