Achlorophyll refers to the absence of chlorophyll, the green pigment found in plants that is essential for photosynthesis. This condition can occur in certain plants or organisms, resulting in a lack of green coloration and often leading to reduced or absent photosynthetic capability. Achlorophyllous plants may rely on other means, such as parasitism or symbiosis, to obtain nutrients. Examples include some species of fungi and certain parasitic plants.