Relating to or containing basalt and muric (relating to walls or fortifications); a geological or architectural term describing mixed composition.
From 'bash-' (base) + 'muric' (from Latin 'murus' meaning wall). This appears to be a specialized scientific term combining geological and structural terminology that evolved in technical literature.
This word is so specialized it almost doesn't appear in regular dictionaries—it's the kind of term geologists or engineers might invent to describe very specific rock formations or building materials that combine volcanic basalt with walled structures.
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