initiator

noun
ini·​ti·​a·​tor | \ in-ˈish-ē-ˌāt-ər How to pronounce initiator (audio) \

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

Learn More About initiator

Dictionary Entries Near initiator

initiation codon

initiator

inj

See More Nearby Entries 

Cite this Entry

“Initiator.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/initiator. Accessed 28 Sep. 2022.

Style: MLA
MLACheck Mark Icon ChicagoCheck Mark Icon APACheck Mark Icon Merriam-WebsterCheck Mark Icon

More from Merriam-Webster on initiator

Thesaurus: All synonyms and antonyms for initiator

Britannica English: Translation of initiator for Arabic Speakers

WORD OF THE DAY

Test Your Vocabulary

Words Named After People

  • name tags
  • Namesake of the leotard, Jules Léotard had what profession?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Universal Daily Crossword

A daily challenge for crossword fanatics.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!