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[Subject: Light & Paraphotic Phenomena]
- Absence of light
Translated by: GIANNI GAVIOLI
Translated in 63 languages
[Subject: Generalities]
Translated by: PATRIZIA GIAMPIERI
Translated in 10 languages
- Want of clearness; obscurity
Translated by: GUEST USER
Translated in 9 languages
[Subject: Physics]
- Electromagnetic radiation that can produce a visual sensation
Translated by: MARCO PRADELLI
Translated in 72 languages