blood moon
noun
variants or Blood Moon
plural blood moons or Blood Moons
: a full moon that coincides with a full lunar eclipse and that has an unusually reddish appearance
Note: The red color of a blood moon is caused by the diffusion of the sun's light into the shadow cast by the Earth.
And when it [the full moon] is eclipsed by the shadow of the Earth, it is called a blood moon as it turns a crimson color. 
IFLSCIENCE.com (London)
IFLSCIENCE.com (London)Through the little windows over the deep double kitchen sink, I saw a big sliver of blood moon sinking below the distant mountains. David Erik Nelson
David Erik Nelson also : a full lunar eclipse during which a blood moon occurs
A blood moon is the unscientific name for a total lunar eclipse, which is when Earth passes in between the sun and the moon, casting a shadow over the moon as sunlight is blocked. BreakingNews.ie
BreakingNews.ie 
Word History
First Known Use
1817, in the meaning defined above
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