family Lepiotaceae fa·mi·ly·lepiotaceae uncommon noun 1. a family of fungi having free gills and a cap that is cleanly separable from the stalk SynonymsLepiotaceaefamily Lepiotaceae Related words Broader terms fungus family Parts Agaricales Part of genus Chlorophyllumgenus Lepiota WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.