这个词是什么意思？
The directional growth of an organism in response to an external stimulus such as light, touch, or gravity. Growth towards the stimulus is a positive tropism; growth away from the stimulus is a negative tropism. (From Concise Dictionary of Biology, 1990)
中文名称索引；定义为 MeSH 英文原文，尚未逐条译审。MESH:D018523 · MeSH 2026。
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