Smith's Bible Dictionary
Knop. A word employed, in the Authorized Version, to translate two terms which refer to some architectural or ornamental object, but which have nothing in common.
1. Caphtor. - This occurs in the description of the candlestick of the sacred tent in Exodus 25:31-36 and Exodus 37:17-22.
2. The second term, Peka'im, is found only in 1 Kings 6:18 and 1 Kings 7:24. The word no doubt signifies some globular thing resembling a small gourd or an egg, though as to the character of the ornament, we are quite in the dark.
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Smith, William, Dr. Entry for 'Knop'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/k/knop.html. 1901.