Designed or treated to resist or prevent flickering, especially in light sources or electrical systems.
From flicker plus proof, where proof (from Old French 'prueve') means resistant or impervious; the compound developed as electrical technology advanced in the 19th-20th centuries requiring terminology for stable light.
Flickerproof is a delightfully technical term that became crucial once we realized flickering lights could cause headaches and discomfort—it's how capitalism solved a problem that nature created as a quirk of electricity.
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