In a transparent, translucent, or clearly visible manner; with the quality of allowing light or vision to pass through easily.
From 'diaphanous' (from Greek 'diaphanês') plus the adverb suffix '-ly'. This adverbial form developed to describe actions or states that are transparently executed.
When a poet writes that moonlight falls 'diaphanously' through trees, they're using a scientific word poetically—turning a precise optical term into a description of something ethereal and ghostly, showing how scientific and romantic languages can beautifully overlap.
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