reagent
B2CEFR level
50/100Rarity: uncommon
TechnicalRegister
A substance added to a sample to produce a measurable chemical reaction during testing.
The analyser paused when the reagent pack expired mid-run, so a new lot was loaded and verified.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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