zack
n. countable C2 Proficiency US //ˈzæk// za·ck
n. a small, sharp piece of metal or glass. You use this word when something tiny and pointy sticks into your skin.
n. a small, sharp fragment of metal, glass, or other hard material that penetrates the skin. Archaic in modern usage; largely replaced by 'splinter' or 'sliver'.
A tiny zack from the fence hurt my finger.
She carefully removed the metal zack from her palm using a pair of tweezers.
The archaic term zack survives in older texts to describe the minute, piercing fragments that cause sudden, sharp pain.