英语词汇“melatonin”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	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, Physiologya 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 + -in² 1955–60
随便看	pitch-and-run shot pitch-and-toss pitch-black pitchblende pitch chain pitch chisel pitch circle pitch cone pitch cylinder pitch-dark pitch-darkness pitched battle pitcher pitcherful pitcherlike pitcher plant pitch-faced pitchfork pitchier pitchiest pitch in pitchiness pitching pitching niblick pitching pennies

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