#tropism  an involuntary orienting response; positive or negative reaction to a stimulus source
  supertype:  reaction.bodily_process__response  a bodily process occurring due to the effect of some foregoing stimulus or agent; "a bad reaction to the medicine"; "his responses have slowed with age"
  subtype:  ergotropism  an affinity for work
  subtype:  geotropism  an orienting response to gravity
  subtype:  heliotropism  an orienting response to the sun
  subtype:  meteortropism  an effect of climate on biological processes (as the effect on joint pains etc.)
  subtype:  neurotropism  an affinity for neural tissues
  subtype:  phototropism  an orienting response to light
  subtype:  trophotropism  an orienting response to food

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