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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From Ancient Greek σκλήρωσις (sklḗrōsis, “hardening”), from σκληρόω (sklēróō, “to harden”), from σκληρός (sklērós, “hard”); by surface analysis, sclero- + -osis.
induration
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Classic usage
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