Oxford Dictionary English leaf mould noun noun BrE BrE//ˈliːf məʊld// ; NAmE NAmE//ˈliːf moʊld// (British English) (North American English leaf mold) [uncountable] Add to my wordlistjump to other resultssoil consisting mostly of dead, decayed leavesCheck pronunciation: leaf mould oxfordlearnersdictionaries.com