Lit or illuminated by candles; having been examined by holding up to candlelight (especially of eggs).
From candle (Latin candela) with past participle -ed. In agricultural contexts, 'candled' specifically refers to the practice of testing egg freshness by holding them to light.
Farmers still use a process called 'candling' to check if eggs have blood spots or developing chicks inside—they literally hold the egg up to a bright light (now electric, not actual candles) to see inside!
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