calla lily cal·la·lily uncommon noun 1. South African plant widely cultivated for its showy pure white spathe and yellow spadix Synonymscalla lilycallaarum lilyZantedeschia aethiopica Related words Broader terms flower Narrower terms pink callagolden calla Parts Zantedeschia WordNet 2.1 (Princeton University). WordNet 2.1 Copyright Princeton University. All rights reserved.