DictionaryRoot: flicorian
Old English
flicorian
to flutter or flap lightly
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verb / noun
flicker
FLIK-ur/ˈflɪkər/
A brief unsteady movement or wavering of light.
Etymology
Flicorian originally described birds fluttering or flapping their wings quickly and lightly. That repeated, unsteady movement supplied the image for light that wavers rather than shines steadily.