Middle French or Latin; Middle French caligineux, from Latin caliginosus, from caligin-, caligo darkness
circa 1550, in the meaning defined above
'Stygian,' 'Umbra,' and Other Words for...
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“Caliginous.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/caliginous. Accessed 7 Dec. 2022.
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