Chloroplast

Definition 1

Photosynthetic organelle containing chlorophyll, the photosynthetic pigment, in cells of leaves and young stems of higher plants. Lens-shaped and rather variable in size but approximately 5 m long. Surrounded by a double membrane and contains circular DNA (though not enough to code for all proteins in the chloroplast). Like the mitochondrion, it is semi-autonomous. It resembles a cyanobacterium from which, on the endosymbiont hypothesis, it might be derived. Chlorophyll is associated with the membrane of vesicles (thylakoids) that are stacked to form grana. (NCI Thesaurus)

Definition 2

Plant cell inclusion bodies that contain the photosynthetic pigment chlorophyll, which is associated with the membrane of THYLAKOIDS. Chloroplasts occur in cells of leaves and young stems of higher plants. (NLM, Medical Subject Headings)

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