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tropism
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English Dictionary: Tropism by the DICT Development Group
2 results for Tropism
From WordNet (r) 3.0 (2006) [wn]:
tropism
n
  1. an involuntary orienting response; positive or negative reaction to a stimulus source
From Webster's Revised Unabridged Dictionary (1913) [web1913]:
   Tropism \Tro"pism\, n. [Gr. [?] a turning, [?] to turn + -ism.]
      (Physiol.)
      Modification of the direction of growth.
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