initiator
/ɪˈnɪʃɪeɪtə(r)/noun
1- a person or thing that initiates someone or something创始人, 发起者; 介绍人; 传授者; 引发物。
1.1
- Chemistry a substance which starts a chain reaction【化】（连锁反应的）引发剂。
1.2
- an explosive or device used to detonate a larger one引爆药; 引爆装置, 起爆器。