Chlorosis

n. plant disease in which the plant loses its green coloring

In botany, chlorosis is a condition in which leaves produce insufficient chlorophyll. As chlorophyll is responsible for the green colour of leaves, chlorotic leaves are pale, yellow, or yellow-white. The affected plant has little or no ability to manufacture carbohydrates through photosynthesis and may die unless the cause of its chlorophyll insufficiency is treated; some chlorotic plants, such as the albino Arabidopsis thaliana mutant ppi2 are viable if supplied with exogenous sucrose. Specific nutrient deficiencies (often aggravated by high soil pH) produce chlorosis, which may be corrected by supplemental feedings of iron, magnesium or nitrogen compounds in various combinations. Some pesticides, particularly herbicides, may also cause chlorosis, both to target weeds and occasionally to the crop being treated.
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Chlo·ro·sis n. A form of chronic anemia, primarily of young women, characterized by a greenish-yellow discoloration of the skin and usually [more]Chlorosis - Community and Resources

Noun
1. iron deficiency anemia in young women; characterized by weakness and menstrual disturbances and a green color to the skin
(synonym) greensickness
(hypernym) iron deficiency anemia, iron deficiency anaemia

(n.)
The green sickness; an anaemic disease of young women, characterized by a greenish or grayish yellow hue of the skin, weakness, palpitation, etc.
  

(n.)
A disease in plants, causing the flowers to turn green or the leaves to lose their normal green color.