initiator

noun
ini·​ti·​a·​tor | \in-ˈish-ē-ˌāt-ər \

Medical Definition of initiator 

: one that initiates: as

a : a substance that initiates a chemical reaction

b : a substance that produces an irreversible change in bodily tissue causing it to respond to other substances which promote the growth of tumors

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Dictionary Entries near initiator

iniencephaly

inion

initiation codon

initiator

inj

inject

injectable

More from Merriam-Webster on initiator

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Britannica English: Translation of initiator for Arabic Speakers

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