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orexin Syllabification: o·rex·in
Pronunciation: /ôˈreksin/

Entry from US English dictionary

Definition of orexin in English:

noun

Either of two hormones ( orexin-A or orexin-B) produced by the mammalian hypothalamus and functional in the regulation of appetite and sleep. Also called hypocretin.

Definition of orexin in:

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Word of the day fortissimo
Pronunciation: fɔːˈtɪsɪməʊ
adverb
(especially as a direction) very loud or loudly