unillumined en · ADJ
Etymology
From un- + illumined.
Meanings
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(not-comparable) Not illumined; unlit.
[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.
1898, H.G. Wells, The War of the Worlds, London: William Heinemann, page 300: