What is the meaning of Thorn?

A sharp protective spine of a plant.

Any shrub or small tree that bears thorns, especially a hawthorn.

That which pricks or annoys; anything troublesome.

A letter of Latin script (capital: Þ, small: þ), borrowed from the futhark; today used only in Icelandic to represent the voiceless dental fricative, but originally used in several early Germanic scripts, including Old English where it represented the dental fricatives that are today written th (Old English did not have phonemic voicing distinctions for fricatives).

To pierce with, or as if with, a thorn (sharp pointed object).

A thorn (spine on a plant with a sharp point)

Thorn or eth (the letter þ and/or ð)

A plant having thorns, especially the hawthorn or rosebush.

Thorns pulled from the ground for burning.

A dish incorporating hawthorn.

thorn; thorny bush

Source: wiktionary.org