[PhilJ]

You can use the glossary addon with the product option labels but not with the actual product options I'm afraid, unless you have some custom coding done.

Demo (see engraving)

In skin/adapt/modules/Product_Options/customer_options.tpl

Replace...

          {if $usertype eq "A"}
            {$v.class}
          {else}
            {$v.classtext|escape|default:$v.class}
          {/if}

With...

          {if $config.Adapt.adapt_addon_glossary eq "Y"}<span class="glossary_highlight">{/if}
          {if $usertype eq "A"}
            {$v.class}
          {else}
            {$v.classtext|escape|default:$v.class}
          {/if}
        {if $config.Adapt.adapt_addon_glossary eq "Y"}</span>{/if}