<span class="searchmatch">grouillât</span> third-person singular imperfect subjunctive of grouiller...
grouillent /ɡʁuj/ imperfect2 grouillasse /ɡʁu.jas/ grouillasses /ɡʁu.jas/ <span class="searchmatch">grouillât</span> /ɡʁu.ja/ grouillassions /ɡʁu.ja.sjɔ̃/ grouillassiez /ɡʁu.ja.sje/ grouillassent...