What is the meaning of Thorn?

A modified branch that is hard and sharp like a spike.

Any thorn-like structure on plants, such as the spine and the prickle.

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, spine of a plant

thorn; thorny bush

Source: wiktionary.org