ˈalpənˌglō noun
( -s )
Etymology: probably part translation of German Alpenglühen, from Alpen Alps + glühen glow
: a reddish glow or sometimes the entire series of light phenomena seen near sunset or sunrise on the summits of mountains ; specifically : a reillumination sometimes observed after the summits have passed into shadow and supposed to be due to a refraction of the light rays from the west resulting from the cooling of the air