(がい)

がい
prefix
foreign; outside; external
1. foreign; external
Prefix indicating something is from abroad or outside.
Foreign cars have high maintenance costs.
(がい) + (しゃ) = foreign car
Foreign loanwords are increasing every year.
(がい) + (らい) = foreign-origin
2. outside; exterior
Prefix indicating the outer or external aspect of something.
I won't yield to outside pressure.
Used as standalone noun meaning 'outside'
Repaint the exterior walls.
You shouldn't judge people by their appearance alone.

(がい)〜 is a productive prefix meaning 'foreign' or 'outside.'

COMMON COMPOUNDS:

ANTONYM PREFIX:
(ない) (internal; inside)