tap / space
Classic usage
Reading level: hard
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
From German Quarz, from Middle High German (Central East German) quarz, twarc, from a West Slavic language [compare Polish twardy (“hard”), Czech tvrdý (“hard”)], from Proto-Slavic *tvьrdъ ultimately from Proto-Indo-European *twerH- (“to enclose, grab”).
quartz glass, vitreous silica, lechatelierite, crystal
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tap / space
Classic usage
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