Sediment, dregs, or grounds:old women told fortunes in grouts of tea
Origin
Old Englishgrūt, of Germanic origin; related to Dutch gruit 'dregs', German Grauss 'grain, weak beer', also to grits and groats. The original meaning was 'coarse meal, groats', also denoting the infusion of malt which was fermented to make beer, hence, in Middle English, 'sediment'.