Crossword clue: the state or quality of being impervious to light; opacity. dr. h. more.
1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).
Possible answers
the quality of being opaque to a degree; the degree to which something reduces the passage of light
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the state or quality of being indiscerpible. dr. h. more.
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