| 单词 | melatonin |
| 释义 | melatonin /mel'euh toh"nin/, n. Physiol. 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. [1955-60; < Gk méla(s) black + TONE + -IN2] |
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