thorn: meaning and definitions

Botany A modified branch in the form of a sharp, woody spine.

Botany Any of various shrubs, trees, or woody plants bearing sharp, woody spines.

Any of various sharp, spiny protuberances; a prickle.

One that causes sharp pain, irritation, or discomfort: He is a thorn in my side.

The runic letter þ originally representing either sound of the Modern English th, as in the and thin, used in Old English and Middle English manuscripts.