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   melatonin

   /ˌmɛləˈtəʊnɪn/

   noun

   • 1. a hormone secreted by the pineal gland which inhibits melanin formation and is thought to be concerned with regulating the reproductive cycle.

   Word Origin 1950s: from Greek melas ‘black’ + serotonin.

   Scrabble Points: 11

   • M

     3

   • E

     1

   • L

     1

   • A

     1

   • T

     1

   • O

     1

   • N

     1

   • I

     1

   • N

     1

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