[医] 实质, 主质; 薄壁组织(植物)

1. animal tissue that constitutes the essential part of an organ as contrasted with e.g. connective tissue and blood vessels

<noun.body>

2. the primary tissue of higher plants composed of thin-walled cells that remain capable of cell division even when mature; constitutes the greater part of leaves, roots, the pulp of fruits, and the pith of stems

<noun.plant>