rill /ɹɪl/adjective 1noun 1verb 1forms 3 adjective1 •(slang) Real. noun1 •A very small brook; a streamlet; a creek, rivulet.[N]or yet beside the rill / Nor up the lawn, nor at the wood was he — 1750 verb1 •To trickle, pour, or run like a small stream.And fainter, finer, trickle far To where the listening uplands are; To pause—then from his gurgling bill Let the warbled sweetness rill, And down the welkin, gushing free, Hark the molten melody — 1862 formsrilled · rilling · rills