Source : Webster's Revised Unabridged Dictionary (1913)

Splintery \Splin"ter*y\ (-[y^]), a.
   Consisting of splinters; resembling splinters; as, the
   splintery fracture of a mineral.

Source : WordNet®

splintery
     adj 1: subject to breaking into sharp slender pieces
     2: resembling or consisting of or embedded with long slender
        fragments of (especially) wood having sharp points; "a
        rough splintery floor of old pine boards" [syn: {slivery}]