1. variety (wine)

2. strain (microbiology, virology)

3. rootstalk, rhizome (underground stem base)

4. grapevine stock, grapevine

5. root (of an animal's tail or horns, etc.)

6. ancestry, stock, origin (of family lineage)

7. pier (of an arch or bridge) (architecture)

8. nucleus (of cloud formation)