It means, in a visual sense, to discern vaguely and incompletely due to distance or unclear atmosphere (fog, etc.) Figuratively it means to conjecture based on illuminating hints from something greater.
if Joyce does not refer to the dew directly in Portrait, even so we can almost vislumbrate the girl through a dreaming atmosphere, through the dew, on the beach ...
by Kin d'Ling January 19, 2003
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