1. (

• irritant ,
• thorn

) something that causes irritation and annoyance; "he's a thorn in my flesh" ;

2. (

• spine ,
• thorn ,
• prickle ,
• pricker ,
• sticker ,
• spikelet

) a small sharp-pointed tip resembling a spike on a stem or leaf ;

3. (

• thorn

) a Germanic character of runic origin ;