initiators

/IH0 N IH1 SH IY0 EY0 T ER0 Z/
noun
  1. 1

    One who initiates.

  2. 2

    A substance that initiates a chain reaction or polymerization.

  3. 3

    A task (in a mainframe computer) that initiates multiple jobs.

  4. 4

    A material whose presence in the body eventually leads to cancer.

Source: https://en.wiktionary.org/wiki/initiator, https://en.wiktionary.org/wiki/initiators