芯

Definitions

 * 1) pith from the common rush, used as lamp wick
 * 2) lamp wick
 * 3)  core material (of something); centre; wick; pencil lead

Etymology
From.

Noun

 * 1) core, heart
 * 2) pencil lead
 * 3) wick
 * 1) wick
 * 1) wick