One of my friend used to bend his thumb backwards. I wonder, is there any word in English to call the nature of thumb bending backwards?
- Anybody can ask a question
- Anybody can answer
- The best answers are voted up and rise to the top
A popular term for those with this remarkable talent, not just in the thumb but elsewhere too, is double-jointed, but it's probably anatomically inaccurate.
In addition to the term double-jointed, you could use the term loose joints. The medical community uses the word hypermobility to explain this condition, which includes the ability to "bend your thumbs to your forearms."
Like Barrie, I don't know of any term related specifically to the thumb, but I did find more than 9,000 hits on Google for "hypermobility of the thumb," and 1,200 for "hypermobile thumb," including some from medical literature.