Simple Definition of hormone

from our Learner's Dictionary

hormone

noun

ˈhoɚˌmoʊn

plural hormones

: a natural substance that is produced in the body and that influences the way the body grows or develops

sex hormones

a hormone deficiency

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“Hormone.” Merriam-Webster.com Simple Definition, Merriam-Webster, https://www.merriam-webster.com/simple/hormone. Accessed 20 Jun. 2026.

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