Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A peptide hormone and neurotransmitter produced by fat cells and involved in the regulation of appetite.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry A protein hormone produced in adipose tissue; it plays a role in regulating appetite and metabolism.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek λεπτός ("thin") + -in

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