The Collaborative International Dictionary of English v.0.48:

Knop \Knop\ (n[o^]p), n. [OE. knop, knoppe; cf. D. knop, knoop,
   G. knopf, Dan. knap, knop, Sw. knapp, knopp, button, bud,
   Icel. knappr, and E. knap, n. Cf. Knap, Knob.]
   1. A knob; a bud; a bunch; a button.
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            Four bowls made like unto almonds, with their knops
            and their flowers.                    --Ex. xxv. 21.
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   2. (Arch.) Any boldly projecting sculptured ornament; esp.,
      the ornamental termination of a pinnacle, and then
      synonymous with finial; -- called also knob, and
      knosp.
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   Knop sedge (Bot.), the bur reed (Sparganium); -- so
      called from its globular clusters of seed vessels.
      --Prior.
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Easton's 1897 Bible Dictionary:

Knop
   some architectural ornament. (1.) Heb. kaphtor (Ex. 25:31-36),
   occurring in the description of the candlestick. It was an
   ornamental swell beneath the cups of the candlestick, probably
   an imitation of the fruit of the almond.

     (2.) Heb. peka'im, found only in 1 Kings 6:18 and 7:24, an
   ornament resembling a small gourd or an egg, on the cedar
   wainscot in the temple and on the castings on the brim of the
   brazen sea.