tailbone
LowNeutral/Informal
Definition
Meaning
The small triangular bone at the base of the spine, the final segment of the vertebral column in humans.
May be used figuratively to refer to the lowest or most backward part of something; in some contexts, can refer to the base of a structure.
Linguistics
Semantic Notes
A colloquial term for the coccyx. It is considered less formal than the anatomical term. The word is a compound of 'tail' and 'bone', reflecting its position and shape.
Dialectal Variation
British vs American Usage
Differences
Both use 'tailbone'. 'Coccyx' is the universal formal/anatomical term.
Connotations
Identical. Slightly informal but medically understood.
Frequency
Similar frequency in both dialects, with 'coccyx' being preferred in formal medical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
I fell and hurt my tailbone.She has a fracture in her tailbone.The pain is in the tailbone region.Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “To be on one's tailbone (rare: meaning to be sitting or resting).”
Usage
Context Usage
Business
Extremely rare, unless in health insurance or ergonomics (e.g., 'chairs designed to reduce tailbone pressure').
Academic
Used in anatomy, physiology, and medical studies, though 'coccyx' is more formal.
Everyday
Common when discussing minor injuries, aches, or sitting discomfort.
Technical
Used in medical diagnostics, orthopaedics, and physiotherapy, often alongside 'coccyx'.
Examples
By CEFR Level
- I fell and my tailbone hurts.
- The baby is born with a small tailbone.
- After the bicycle accident, she bruised her tailbone.
- Sitting on a hard surface for too long can cause tailbone pain.
- The doctor confirmed it was a fractured tailbone, not just a bruise.
- Some yoga poses can help alleviate discomfort in the coccyx, or tailbone.
- Coccydynia, or persistent tailbone pain, can be challenging to diagnose and treat effectively.
- The evolutionary remnant of the tail, the tailbone, serves as an attachment point for various pelvic ligaments and muscles.
Learning
Memory Aids
Mnemonic
Think of a dog's tail. The tailbone is the little 'bone' where a tail would be, at the very end of your backbone.
Conceptual Metaphor
THE BODY IS A STRUCTURE: The tailbone is the foundation stone or final piece of the spinal column.
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not translate literally as 'хвостовая кость'—it is understood but unnatural. The correct term is 'копчик'.
Common Mistakes
- Spelling as 'tail bone' (two words) is common but the closed compound 'tailbone' is standard. Using it as a verb (e.g., 'I tailboned myself').
Practice
Quiz
What is the primary formal/anatomical synonym for 'tailbone'?
FAQ
Frequently Asked Questions
No, 'tailbone' is a common, informal term. The formal anatomical term is 'coccyx'.
Yes, a tailbone (coccyx) fracture is a possible injury, typically from a fall directly onto the buttocks.
It provides slight support and is an attachment site for tendons, ligaments, and muscles of the pelvic floor.
Yes, the coccyx is considered a vestigial structure, an evolutionary remnant of a tail from our ancestors.