Capable of being dug; suitable for digging.
From 'dig' (Old English and Old Norse 'digga') plus the adjective suffix '-able'. The root is likely imitative or from Scandinavian languages, while '-able' comes from Latin 'habilis' meaning 'able to hold'.
Soil scientists use 'diggable' to classify earth based on whether it can be excavated by hand or machine—frozen ground is much less diggable than loose loam, which matters enormously for construction!
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