[1] : The Collaborative International Dictionary of English v.0.48

calla \cal"la\ ka^l"l.a, n. linnaeus derived calla fr.
   gr. ??????? a cock's wattles but cf. l. calla, calsa, name of
   an unknown plant, and gr. kalo`s beautiful. bot.
   a genus of plants, of the order araceae.
   1913 webster

   note: the common calla of cultivation is richardia
         africana, belonging to another genus of the same
         order. its large spathe is pure white, surrounding a
         fleshy spike, which is covered with minute apetalous
         flowers.
         1913 webster
see also:
araceae calla richardia africana 

[2] : WordNet (r) 2.0

calla
     n 1: south african plant widely cultivated for its showy pure
          white spathe and yellow spadix syn: calla lily, arum
          lily, zantedeschia aethiopica
     2: water arum syn: genus calla
see also:
calla lily arum lily zantedeschia aethiopica genus calla 

Calla >> C Words
Calla, definition of term: Calla
calla_pag1.html

Calla Lily >> C Words
Calla Lily, definition of term: Calla Lily
calla+lily_pag1.html