Firmly fixed or embedded in the earth; immovable or deeply rooted.
Compound of 'earth' and 'fast' (archaic meaning 'fixed' or 'secure'). Historically used to describe wooden posts or structures driven directly into the ground without a foundation.
In archaeology, 'earthfast' post holes reveal ancient buildings—by examining where wooden posts rotted into the soil, archaeologists can 'see' houses that vanished thousands of years ago.
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