[Middle English gloming, from Old English glōmung, alteration (probably influenced by æfnung, evening) of glōm, dusk; see ghel-2 in Indo-European roots.]
O.E. glomung, formed (probably on model of æfning "evening") from glom "twilight," related to glowan "to glow," hence "glow of sunrise or sunset," from P.Gmc. *glo- (see glow). Fell from currency except in Yorkshire dialect, but preserved in Scotland and reintroduced by Burns and other Scottish writers after 1785.
[gloh-ming] 
