ispell-dictionary-alist

ispell-dictionary-alist is a variable defined in `ispell.el'.
Its value is

nil

Documentation:
An alist of dictionaries and their associated parameters.

Each element of this list is also a list:

(DICTIONARY-NAME CASECHARS NOT-CASECHARS OTHERCHARS MANY-OTHERCHARS-P
ISPELL-ARGS EXTENDED-CHARACTER-MODE CHARACTER-SET)

DICTIONARY-NAME is a possible string value of variable `ispell-dictionary',
nil means the default dictionary.

CASECHARS is a regular expression of valid characters that comprise a word.

NOT-CASECHARS is the opposite regexp of CASECHARS.

OTHERCHARS is a regexp of characters in the NOT-CASECHARS set but which can be
used to construct words in some special way. If OTHERCHARS characters follow
and precede characters from CASECHARS, they are parsed as part of a word,
otherwise they become word-breaks. As an example in English, assume the
regular expression "[']" for OTHERCHARS. Then "they're" and
"Steven's" are parsed as single words including the "'" character, but
"Stevens'" does not include the quote character as part of the word.
If you want OTHERCHARS to be empty, use the empty string.
Hint: regexp syntax requires the hyphen to be declared first here.

CASECHARS, NOT-CASECHARS, and OTHERCHARS must be unibyte strings
containing bytes of CHARACTER-SET. In addition, if they contain
non-ASCII bytes, the regular expression must be a single
`character set' construct that doesn't specify a character range
for non-ASCII bytes.

MANY-OTHERCHARS-P is non-nil when multiple OTHERCHARS are allowed in a word.
Otherwise only a single OTHERCHARS character is allowed to be part of any
single word.

ISPELL-ARGS is a list of additional arguments passed to the ispell
subprocess.

EXTENDED-CHARACTER-MODE should be used when dictionaries are used which
have been configured in an Ispell affix file. (For example, umlauts
can be encoded as \"a, a\", "a, ...) Defaults are ~tex and ~nroff
in English. This has the same effect as the command-line `-T' option.
The buffer Major Mode controls Ispell's parsing in tex or nroff mode,
but the dictionary can control the extended character mode.
Both defaults can be overruled in a buffer-local fashion. See
`ispell-parsing-keyword' for details on this.

CHARACTER-SET used to encode text sent to the ispell subprocess
when the language uses non-ASCII characters.

Note that with "ispell" as the speller, the CASECHARS and
OTHERCHARS slots of the alist should contain the same character
set as casechars and otherchars in the LANGUAGE.aff file (e.g.,
english.aff). aspell and hunspell don't have this limitation.