Spelk is a small, sharp piece of wood or splinter that has pierced the skin. Some synonyms for the word "spelk" include sliver, shard, splinter, thorn, prick, or needle. These words all describe a similar object or sensation of something small and sharp piercing the skin. Additionally, some regional synonyms for spelk include skelf, spike, prickle, or sticker. These words are commonly used in northern England, Scotland, and Ireland. No matter the word used to describe it, a spelk is a painful and irritating occurrence that should be treated carefully to avoid infection or further damage.