<span class="searchmatch">diffūdissent</span> third-person plural pluperfect active subjunctive of diffundō...
pluperfect diffūdissem diffūdissēs diffūdisset diffūdissēmus diffūdissētis <span class="searchmatch">diffūdissent</span> passive present diffundar diffundāris, diffundāre diffundātur diffundāmur...