1. To bleach and alter the natural development of (a green plant) by excluding sunlight.
2. To make pale or sickly.
3. To make weak by stunting the growth or development of.
4. To become pale; to make pale by depriving of light
5. Make pale or sickly, especially by depriving of light.

(Especially of plants) Developed without chlorophyll by being deprived of light; SYN. etiolated, blanched.