opacity
B2CEFR level
65/100Rarity: rare
TechnicalRegister
An area on an image that appears whiter than expected because it blocks more radiation.
A rounded opacity was noted in the right lower zone and warranted comparison with old films.
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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