Cyrilliaceae cy·ril·lia·ceae uncommon noun 1. shrubs and trees with leathery leaves and small white flowers in racemes: genera Cyrilla and Cliftonia Synonymsfamily Cyrilliaceaecyrilla familytiti family Related words Broader terms dicot Parts Sapindales Part of genus CyrillaCliftonia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.