Diapensiaceae dia·pen·sia·ceae uncommon noun 1. north temperate low evergreen plants; in some classifications placed in its own order Diapensiales Synonymsfamily Diapensiaceaediapensia family Related words Broader terms dilleniid dicot family Parts Ericales Part of genus Diapensiagenus GalaxPyxidantheragenus Shortia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.