from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The central cylinder in which the primary vascular tissue is arranged around a pith, as in most seed plants.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A type of siphonostele, in which the vascular tissue in the stem forms a central ring of bundles around a pith.
Sorry, no etymologies found.