From an unused root meaning to encircle; a capital of a column -- chapiter.
H6858. tsepheth
צֶ֫פֶת noun feminine apparently plated capital of pillar2 Chronicles 3:15.
צפח (√ of following; compare Arabic II. make wide, broad; anything broad (stone, plank, sheathing, plating), Syriac plating; also Ethiopic spread out, extend; Sabean (Lihyanian) אצפחת הצפחת, platform, DHMEpigr. Denkm. 84. 86; but (transposed) Arabic , wide bowl, compare Frä63).