tropism
tropism[ˈtrəʊpɪz(ə)m, ˈtrɒp-]noun- [mass noun](Biology)the turning of all or part of an organism in a particular direction in response to an external stimulus
(生)向性;趋化性
语源- late 19th cent.: from Greek tropos 'turning' (from trepein 'to turn') + -ism
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