from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A mound of soil, sand, or dirt formed by ants or termites in digging or building a nest.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A cone-shaped formation constructed from sediment and other available materials by ants or termites. The colony nests underneath this cone.
From Middle English ametehul, from Old English ǣmethyll ("anthill"), equivalent to ant + hill. (Wiktionary)