[A] peculiar luminous and sinuous marking appeared on the unillumined half of the inner planet, and almost simultaneously a faint dark mark of a similar sinuous character was detected upon a photograph of the Martian disc.
Source: wiktionary
Unillumined
Synonyms for "unillumined"
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.