splinter

A sharp, slender piece, as of wood, bone, glass, or metal, split or broken off from a main body.

A splinter group.

To split or break into sharp, slender pieces; form splinters.

To cause to splinter. synonym: break.

A sharp-edged fragment of anything split or shivered off more or less in the direction of its length; a thin piece (in proportion to its length) of wood or other solid substance rent from the main body; a splint.