Definition

1. Noun:
   • A sharp, stiff, pointed projection on a plant stem: A thorn is a modified branch or stem that is hard and sharp, serving as a defense mechanism for many plants, especially shrubs and trees.
   • A source of continual annoyance or trouble: Figuratively, a thorn is something or someone that causes persistent irritation or difficulty.
   • The name of a letter in the Old English and Icelandic alphabets: Thorn (þ, Þ) is a runic character representing the "th" sound.

Examples of Usage

• Noun (Botanical):
  • Be careful when picking roses; they have sharp thorns.
  • The hawthorn tree is named for the thorns on its branches.
• Noun (Figurative):
  • The unresolved issue became a thorn in their relationship.
  • He was a thorn in the side of the administration, constantly questioning their decisions.

Advanced Usage

• "A thorn in one's side/flesh": A persistent source of annoyance or trouble.
  • The noisy construction next door has been a thorn in my side for months.
• "To be/sit on thorns": To be in a state of anxiety or nervous anticipation. (Note: This is a less common, more literary expression akin to "to be on tenterhooks" or "to be on pins and needles.")
  • She was on thorns waiting for the exam results.

Variants and Related Words

• Thorny (adjective): Having thorns; figuratively, difficult and problematic.
  • We had to navigate a thorny path through the bushes.
  • The committee faced the thorny issue of budget cuts.
• Thornless (adjective): Lacking thorns.
  • Botanists have developed a thornless variety of blackberry.

Synonyms

• Spine: A stiff, sharp-pointed projection (often used interchangeably with thorn in botany, though spines can be modified leaves).
• Prickle: A small, sharp outgrowth from the epidermis of a plant (e.g., on a rose stem).
• Irritant: Something that causes annoyance (figurative synonym).
• Nuisance: A person, thing, or circumstance causing inconvenience or annoyance (figurative synonym).

Related Phrases

• "No rose without a thorn": A proverb meaning that even good or pleasant things have their accompanying difficulties or drawbacks.
  • The promotion came with much more responsibility—there's no rose without a thorn.

Noun

1. a Germanic character of runic origin
2. a small sharp-pointed tip resembling a spike on a stem or leaf
3. something that causes irritation and annoyance
   • he's a thorn in my flesh