patulous
adjective
pat·u·lous ˈpa-chə-ləs 
: spreading widely from a center
a tree with patulous branches
Word History
Etymology
Latin patulus, from patēre to be open — more at fathom
First Known Use
1616, in the meaning defined above
Medical Definition
patulous
adjective
pat·u·lous ˈpach-ə-ləs
: spread widely apart : wide open or distended
a patulous eustachian tube