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melatonin
释义
WordReference Random House Unabridged Dictionary of American English © 2024
mel•a•to•nin
(mel′ə tō
′
nin),
USA pronunciation
n.
[
Physiol.
]
Biochemistry, Physiology
a hormone secreted by the pineal gland in inverse proportion to the amount of light received by the retina, important in the regulation of biorhythms: in amphibians, it causes a lightening of the skin.
Greek
mélā
(
s
) black +
tone
+ -
in
2
1955–60
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更新时间:2025/11/15 15:26:53