offshoot /ˈɒfˌʃuːt/

• 1. 

  N-COUNT If one thing is an offshoot of another, it has developed from that other thing. 衍生物; 分支

  例：

  Psychology began as a purely academic offshoot of natural philosophy.

  心理学形成之初是作为自然哲学的一个纯学术分支。