Shining or gleaming with a soft glow or brightness.
From prefix 'a-' (in state of) + 'gleam'. Like other 'a-' adjectives, this was common in Middle English but survives mainly in poetic or archaic usage today.
Poets love this word because it sounds musical—the 'gl' start mimics light itself, and adding the 'a-' makes it feel more mysterious and old-fashioned, perfect for describing moonlit scenes in fantasy novels.
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