The quality or extent to which something can be drilled or penetrated with a drill tool.
Formed from 'drill' (from Old French 'drille,' a type of cloth that inspired the tool name) plus the suffix '-ability' (from Latin 'habilis' meaning capable). The term emerged in engineering and geology in the 20th century.
Oil companies and geothermal engineers obsess over drillability because rocks with different mineral compositions require completely different drilling strategies—it's why drill bits have special coatings for specific rock types.
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