ant cow

from WordNet (r) 3.0 (2006)
ant cow
    n 1: excretes a honeylike substance eaten by ants
    
from The Collaborative International Dictionary of English v.0.48
Ant cow \Ant cow\ (Zool.)
   Any aphid from which ants obtain honeydew. The plural form is
   {ant cattle}.
   [Webster 1913 Suppl.]
    

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