etiolation

/,i:tiou'leiʃn/
Noun
  1. (botany) the act of causing a plant to develop without chlorophyll by growing it without exposure to sunlight
    • the etiolation of celery
  2. the act of weakening by stunting the growth or development of something
    • the etiolation of the critical tradition
  3. a pale and sickly appearance
    • his etiolation signaled years in prison

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etiolation
The gardener observed the etiolation of the seedlings grown in the dark cupboard.