See fungus-growing ant.
[From New Latin Attīnī, tribe name, from Atta, type genus of the tribe, perhaps from Latin atta, one who walks only on the front of the foot because of a defect, toe-walker (perhaps in reference to the long slender legs of fungus-growing ants), or from Greek and Latin atta, father (used as a term of respect for older men).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.