Bolster

The Hebrew word kebir, rendered “pillow” in 1 Sam 19:13, 1 Sam 19:16, but in Revised Version marg. “quilt” or “network,” probably means some counterpane or veil intended to protect the head of the sleeper. A different Hebrew word (meraashoth’) is used for “bolster” (1 Sam 26:7, 1 Sam 26:11, 1 Sam 26:16). It is rightly rendered in Revised Version “at his head.” In Gen 28:11, Gen 28:18 the Authorized Version renders it “for his pillows,” and the Revised Version “under his head.” In Ezek 13:18, Ezek 13:20 another Hebrew word (kesathoth) is used, properly denoting “cushions” or “pillows,” as so rendered both in the Authorized and the Revised Version.

From Easton’s Bible Dictionary (1897), by Matthew George Easton.