calla US/ˈkælʌ/ rare noun 1. South African plant widely cultivated for its showy pure white spathe and yellow spadix Synonymscalla lilyarum lilyZantedeschia aethiopica 2. water arum Synonymsgenus Calla Related words Word family callableCallascallathumpcalla lilyCalla palustris Broader terms monocot genusflower Narrower terms pink callagolden calla Parts AraceaeZantedeschia Part of wild calla WordNet 2.1 (Princeton University). CMU Pronouncing Dictionary. WordNet 2.1 Copyright Princeton University. All rights reserved.