- irritant, thorn - something that causes irritation and annoyance; "he's a thorn in my flesh"
--1 is a kind of annoyance, bother, botheration, pain, infliction, pain in the neck, pain in the ass
- spine, thorn, prickle, pricker, sticker - a sharp-pointed tip on a stem or leaf
--2 is a kind of aculeus
--2 has particulars: glochidium, glochid - thorn - a Germanic character of runic origin
--3 is a kind of rune, runic letter