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The ClueWhiten, as a plant (8 letter answer)
NotesThe answer ETIOLATE is seen occasionally, appearing about once every 900 puzzles.
Drain of color
Enfeeble or bleach
DefinitionETIOLATE as a verb:
1. make weak by stunting the growth or development of
2. bleach and alter the natural development of (a green plant) by excluding sunlight
3. make pale or sickly; "alcohol etiolates your skin"
ETIOLATE as an adjective:
1. (etiolate, etiolated, blanched) = (especially of plants) developed without chlorophyll by being deprived of light; "etiolated celery"