One of the mysteries of the English language finally explained.
Attributive and in the genitive. Used with reference to an electro-optical effect in certain crystals similar to the Kerr effect in liquids; especially in "Pockels cell", "Pockels constant", "Pockels effect".
1930s; earliest use found in Proceedings of the Royal Society of London. From the name of Friedrich Carl Alwin Pockels, German physicist, who described the effect in 1894.
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