From The Collaborative International Dictionary of English v.0.48 [gcide]:
Alpenglow \Al"pen*glow'\, noun A reddish glow seen near sunset or sunrise on the summits of mountains; specif., a reillumination sometimes observed after the summits have passed into shadow, supposed to be due to a curving downward (refraction) of the light rays from the west resulting from the cooling of the air. [Webster 1913 Suppl.] Alpenhorn
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