Definition of tropism noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈtrəʊpɪzəm//
, BrE//ˈtrɒpɪzəm//
; NAmE NAmE//ˈtroʊpɪzəm//
[uncountable] (biology)
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the action of a living thing turning all or part of itself in a particular direction, towards or away from something such as a source of light Word Originlate 19th cent.: from Greek tropos ‘turning’ (from trepein ‘to turn’) + -ism.
See the Oxford Advanced American Dictionary entry: tropism