wài
outside
Phonosemantic compound. 卜 represents the meaning and 月 represents the sound.
Components
Evolution

Oracle script
(~1250-1000 BC)
Bronze script
Early Western Zhou (~1000 BC)
Seal script
Shuowen (~100 AD)
Clerical script
Eastern Han dynasty (25-220 AD)Regular script
ModernDefinitions
Sources
季旭昇《說文新證》p.555-556