Definitions for "Plastid"
any of several types of minute granules found in the protoplasm of vegetable cells, having their own membrane, robosomes, and DNA. Among plant cells the most common are chloroplasts, which contain the chlorophyll and the photosynthetic machinery of the cell. They are divided by their colors into three classes, chloroplastids, chromoplastids, and leucoplastids.
Cytoplasmic organelle in plants, bounded by a double membrane, that carries its own DNA and is often pigmented. Chloroplasts are plastids.
A double membrane-bound cytoplasmic organelle containing DNA found in plants. Plastids include chloroplasts and chromoplasts.
Encyclopaedia Britannica 2002
A formative particle of albuminous matter; a monad; a cytode. See the Note under Morphon.