1) The living matter of cells 
The symplast of a plant is the inner side of the plasma membrane in which water (and low-molecular-weight solutes) can freely diffuse. The plasmodesmata allow the direct flow of small molecules such as sugars, amino acids, and ions between cells. Larger molecules, including transcription factors and plant viruses, can also be transported through w...
<plant biology> The intracellular compartment of plants, consisting of the cytosol of a large number of cells connected by plasmodesmata. ... (19 Jan 1998) ... 
The living matter of cells; the cytoplasm.The intracellular compartment of plants, consisting of the cytosol of a large number of cells connected by plasmodesmata.
Type: Term Pronunciation: sim′plast Definitions: 1. A multinucleated cell that has formed by fusion of separate cells.