pixel defect; dead pixel
Technical term for a defective pixel on an LCD or similar display; often used in contexts like monitor quality checks. Compare ドット抜け, which is a more common synonym.
See also: ドット抜け
I found a pixel defect on the new monitor.
Compound of 画素 (pixel) and 欠け (lack, missing part). The exact derivation is straightforward; the term is a modern technical coinage.