Noun Definitionthorn1.Definition: a Germanic character of runic originCategory: General2.Definition: a small sharp-pointed tip resembling a spike on a stem or leafRelated Noun(s):pricker, prickle, spikelet, spine, stickerCategory: Plants3.Definition: something that causes irritation and annoyance"He's a thorn in my flesh"Related Noun(s):irritantCategory: General