"callas" in the noun sense
1. calla lily, calla, arum lily, Zantedeschia aethiopica
South African plant widely cultivated for its showy pure white spathe and yellow spadix
2. Calla, genus Calla
Source: WordNet® (An amazing lexical database of English)
Princeton University "About WordNet®."
WordNet®. Princeton University. 2010.
View WordNet® License