To specify output formats for the glossary:
[Glossary] ; GLSTitleFormat = format for the glossary title GLSTitleFormat = GlossaryTitle ; GLSTOCFormat = format for TOC entry for the glossary title GLSTOCFormat = GLS
Default formats for glossary components and references are specified in %OMSYSHOME%\d2g\system\config\d2g_config.ini:
[BlockFormatMaps] glossarylist/* = GLS glossarylist/booklists/backmatter/bookmap/1 = TOC2P title/$topic/glossarylist/booklists/backmatter/$map/1 = GlossaryTitle glossterm/* = Heading1 glossdef/* = Abstract glossAbbreviation/* = Heading2S glossAcronym/* = Heading2S glossSynonym/* = Heading2S gloss* = Body
[InlineFormatMaps] glossPartOfSpeech/* = Bold gloss* = No
See §6.4.2 Mapping block and inline element paths to formats. The formats are defined in %OMSYSHOME%\d2g\system\formats\d2htm_formats.ini (for HTML output) and d2rtf_formats.ini (for RTF output).
If you change any format names, you must either alias your names to the default names, or provide your own definitions in a format configuration file; see §7. Configuring output formats.
See also §14.7.3.4 Formatting output for the abbreviated-form element.