external

US /ɪkˈstɝː.nəl/
UK /ɪkˈstɝː.nəl/
"external" picture
1.

belonging to or forming the outer surface or structure of something

:
The building's external walls are made of brick.
The device has an external antenna for better reception.
2.

coming or derived from an outside source

:
The company relies heavily on external funding.
We need to consider the external factors affecting our business.