Origin: ME (Scot) glomyng < OE glomung < glom, twilight, akin to glowan, to glow: adopted in literature < Scot dial.
See gloaming in American Heritage Dictionary 4
Origin: Middle English gloming
Origin: , from Old English glōmung
Origin: , alteration (probably influenced by ǽfnung, evening)
Origin: of glōm, dusk; see ghel-2 in Indo-European roots.
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