Alpenglow \Al"pen*glow`\, n.
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