The DICT-server can give MIME content, i.e. give arbitrary content without restrictions with reference to their type. If the DICT-client is able to receive a MIME content, it shall send the command OPTION MIME to the DICT-server (see dict -M). In this case, the DICT-client goes to processing task of the content. dictd, in turn, can give Plain Text or MIME content depending on whether if the client gave the command OPTION MIME to him. See
A Dictionary Server Protocol. So, DICT-dictionary can consist of two modules: one with PlainText content, and other with a MIME content. In the file /usr/share/doc/dictd/examples/dictd_mime.conf we can find for example how to set up the configuration file /etc/dictd/dictd.conf in order to DICT-server will able properly to process the command OPTION MIME.
I would like to express the wish that GoldenDict knew how to work correctly with such modules of DICT-dictionaries that contain the MIME content. For this purpose I can put such module in order to assist the development of this support.