hĕksə-dĕsə-məl
Of, relating to, or based on the number 16.

Of or relating to sixteenths.
A number system having 16 as its base.
noun
A sixteenth.
noun
Designating or of a number system in which the base used is 16
Of, relating to, or based on the number 16. &diamf3; The hexadecimal number system is a way of representing numbers where each successive digit or number represents a multiple of a power of 16. It uses the digits 0–9 plus the letters A, B, C, D, E, and F to represent the decimal values 10–15. For example, 4B7E represents (4 × 163 ) + (11 × 162 ) + (7 × 161 ) + (15 × 160 ), or 19,327 in the decimal system.
See hex.
Refers to the base 16 numbering system, consisting of 16 unique symbols—the numbers from 0 through 9 and the letters from A to F. This system is useful because it represents every byte (that is, 8 bits) as two consecutive hexadecimal digits, which are easier for people to read than binary numbers. For example, 15 is represented as “F” in the hexadecimal numbering system. To translate a hexadecimal value to a binary one, an individual turns every hexadecimal digit into its 4-bit binary counterpart, such that hexadecimal numbers have either a 0x prefix or an h suffix. For example, the hexadecimal number 0x3F7A translates into this binary number: 0011 1111 0111 1010. Jupitermedia Corporation. Hexadecimal. [Online, March 31, 2003.] Jupitermedia Corporation Website. http://www.webopedia.com/TERM/H/hexadecimal.html.
(arithmetic, computing) A number system with base 16, using the digits 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E and F, useful in computing as a hexadecimal digit can represent four bits, half a standard byte. Informal short form used in computing: hex.
noun
Of a number, expressed in hexadecimal.