Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A hormone or another agent that causes or stimulates secretion.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A substance (such as a hormone) that stimulates secretion.

Etymologies

secret(ion)1 + -agogue.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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