thumbnail moon
 n.— «The moon, which is about 15 per cent illuminated, or more commonly called a “thumbnail moon,” is said to be a setting moon and will move rapidly through the night sky early on making its decent.» —“Venus and Jupiter to Align With Moon, Not Visible Again For Another 44 Years” by Nikki Weingartner Digital Journal (Toronto, Ontario, Canada) Dec. 1, 2008. (source: Double-Tongued Dictionary)

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