"transparent, translucent, admitting the passage of light," 1610s, from Latin pellucidus "transparent," from pellucere "shine through," from per- "through" (from PIE root *per- (1) "forward," hence "through") + lucere "to shine" (from suffixed form of PIE root *leuk- "light, brightness"). Related: Pellucidly; pellucidity.
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