From: Bob Stout 

The ANSI/ISO/IEC standard is available in PDF format for as little as $18,
downloadable from http://webstore.ansi.org/ansidocstore/>. I suggest
everyone buy a copy and keep it on their machine.

To the question at hand... Referring to ISO/IEC 9899:1999, "5.2.4.2.1
Sizes of integer types ", the only hard-wired type is
char (signed or unsigned), for which CHAR_BIT is defined as 8. All other
integral types are defined by minima and maxima. A "word" is not
a formal integral type in the standard.  In most implementations, a word is
16 bits. More problematic is an int which is typically 16 bits on 8- and
16-bit architectures, or 32 bits on 32-bit or larger architectures.

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