Definition of melatonin

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  • melatonin is a valid Scrabble US word with a point value of 11
  • melatonin is a valid Scrabble UK word with a point value of 11
  • melatonin is a valid Words with friends word with a point value of 15

Definition of melatonin

  • hormone secreted by the pineal gland (noun)

See definition of melatonin in Merriam Webster