Plural of anthill; large mounds of earth built by ants as the external structure of their underground colonies where they live and work.
Compound from Old English 'æmette' (ant) + 'hill'. The word has been used since at least the 10th century to describe the visible dome-shaped nests ants construct.
An anthill is only the tip of the iceberg—the visible mound might be just 5% of the actual colony, with tunnels extending 20+ feet underground, making ants the ultimate architects of hidden cities.
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