The superlative form of 'cherty'; most resembling or containing the most chert.
From 'cherty' plus the superlative suffix '-est'. This follows standard English morphology for creating the highest degree of comparison in adjectives.
Superlatives like 'chertiest' reveal how specialists in any field create fine distinctions—a geologist examining rock layers might identify the 'chertiest' layer as having the densest concentration of silica crystals.
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