A thorny evergreen shrub, with yellow flowers, Ulex gen. et spp., of which Ulex europaeus is particularly common upon the plains and hills of Great Britain and Ireland.
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).
A sharp protective spine of a plant.
To pierce with, or as if with, a thorn (sharp pointed object).