WordWeb Online

1. Something that causes irritation and annoyance
   "he's a thorn in my flesh";
   - irritant
    
2. A small sharp-pointed tip resembling a spike on a stem or leaf
   - spine, prickle, pricker, sticker, spikelet
    
3. A Germanic character of runic origin

Derived forms: thorns

Type of: aculeus, annoyance, bother, botheration [informal], infliction, irritation, nuisance, pain, pain in the neck [informal], rune, runic letter

Encyclopedia: Thorn, Netherlands