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Classic usage
Reading level: easy
Estimated CEFR level: A1 — Beginner
Estimated from word frequency; not an official CEFR classification.
From the Old English lower case letter d, from 7th century replacement by Latin lower case d of the Anglo-Saxon Futhorc letter ᛞ.
vitamin D, calciferol, viosterol, ergocalciferol, cholecalciferol
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Classic usage
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