hy·dro·tho·rax 
(hī′drə-thôrăks′)
(hī′drə-thôrăks′)n.
Accumulation of serous fluid in one or both pleural cavities.
- uniform resource locator
- unify
- unilateral
- unilateralism
- unilateralist
- unilaterally
- unilinear
- unilingual
- unilobar
- unilocular
- unimaginable
- unimaginably
- Unimak Island
- unimpassioned
- unimpeachable
- unimpeachably
- unimportance
- unimportant
- unimproved
- uninformative
- uninformatively
- uninformed
- uninhabitability
- uninhabitable
- uninhabited