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Synonyms
thorn (thôrn)

[Middle English, from Old English.]

noun 

  1. Botany
    1. A modified branch in the form of a sharp, woody spine.
    2. Any of various shrubs, trees, or woody plants bearing sharp, woody spines.
  2. Any of various sharp, spiny protuberances; a prickle.
  3. One that causes sharp pain, irritation, or discomfort: He is a thorn in my side.
  4. 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.

derivatives

thorńless
adjective