an aphid that excretes honeydew and is tended by honeydew-gathering ants.
Origin of ant cow
First recorded in 1870–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an insect, esp an aphid, that excretes a sweet honey-like substance that is collected and eaten by ants
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012